Pressure distribution on an ellipto-zhukovsky aerofoil Essay Example

Pressure distribution on an ellipto-zhukovsky aerofoil Paper The pressure distribution around an Ellipto Zhukovsky aerofoil with a chord of 254 mm at a range of angles of attack (-4? , 7? and 15? ) was determined and pressure contributions to lift were evaluated in a T3 wind tunnel at City University. This was carried out at a chord Reynolds number of 3. 9 x 105. Graphs for lift and pitching moment coefficients were plotted against angles of attack. A graph for Cm and Cl was also plotted from which the aerodynamic centre was determined to be 23. 7%. The value of lift curve slope was determined to be 4. 4759. Hence the value of k (the ratio of the actual lift curve slope to the theoretical one) for this aerofoil was determined to be 0. 917. The value of Cmo was also found to be 0. 0172. Specimen calculations for 15 degrees angle of attack can be found in the appendix section. LIST OF SYMBOLS Cp Pressure Coefficient Cpu Pressure Coefficient of upper surface Cpl Pressure Coefficient of lower surface Cl Lift Coefficient Cm Moment Coefficient x/c Position of pressure tapping on aerofoil divided by chord length Px Pressure at tapping x (Pa) Patm Atmospheric Pressure (Pa) ? Density of air (kg/m3) i Dynamic viscosity ? Kinematics viscosity (m/s2) We will write a custom essay sample on Pressure distribution on an ellipto-zhukovsky aerofoil specifically for you for only $16.38 $13.9/page Order now We will write a custom essay sample on Pressure distribution on an ellipto-zhukovsky aerofoil specifically for you FOR ONLY $16.38 $13.9/page Hire Writer We will write a custom essay sample on Pressure distribution on an ellipto-zhukovsky aerofoil specifically for you FOR ONLY $16.38 $13.9/page Hire Writer h Digital manometer reading ? angle of which manometer is inclined D or t Diameter of cylinder (mm) h tunnel height (mm) V Velocity of air flow (m/s) R Molar gas constant (J/kg. K) T Temperature (K) Re Reynolds Number INTRODUCTION An airfoil is any part of an airplane that is designed to produce lift. Those parts of the airplane specifically designed to produce lift include the wing and the tail surface. In modern aircraft, the designers usually provide an airfoil shape to even the fuselage. A fuselage may not produce much lift, and this lift may not be produced until the aircraft is flying relatively fast, but every bit of lift helps. The first successful aerofoil theory was developed by Zhukov sky and was based on transforming a circle onto an aerofoil-shaped contour. This transformation gave a cusped trailing edge, and so the transformation was modified to obtain a slender semi-eclipse trailing edge, which gave rise to the name Ellipto Zhukovsky. When a stream of air flows past an aerofoil, there are local changes in velocity around the aerofoil, and consequently changes in static pressure in accordance with Bernoullis theorem. The distribution of pressure determines the lift, pitching moment, form drag, and centre of pressure of the aerofoil. In our experiment we are concerned with the effect of pressure distribution on lift, pitching moment coefficient (Cm), and centre of pressure. The centre of pressure can be defined as the point on the aerofoil where Cm is zero, and therefore the aerodynamic effects at that point may be represented by the lift and drag alone. A positive pressure coefficient implies a pressure greater than the free stream value, and a negative pressure coefficient implies a pressure less than the free stream value (and is often referred to as suction). Also, at the stagnation point, Cp has its maximum value of 1 (which can be observed by plotting Cp against x/c). Zhucovsky claimed that the aerofoil generates sufficient circulation to depress the rear stagnation point from its position, in the absence of circulation, down to the (sharp) trailing edge. There is sufficient evidence of a physical nature to justify this hypothesis and the following brief description of the Experiment on an aerofoil may serve helpful. The experiment focuses on the pressure distribution around the Zhucovsky airfoil at a low speed and the characteristics associated with an airfoil:  coefficient of lift,   coefficient of pitching moment   and centre of pressure. The airfoil is secured to both sides of the wind tunnel with pressure tappings made as small as possible not to affect the flow,(appendix- photo 1 . The pressure difference around the airfoil is measured with twenty-five manometer readings which are recorded for each angle of attack. The manometer fluid is alcohol and has a specific gravity of 0. 83 and inclined at an angle of 30 degrees. Tube 1 is left open to atmospheric pressure, while tubes 2-13 are the lower surface of the airfoil and tubes 14-24 are the upper surface of the airfoil. The pressure tapings are positioned on the airfoil at a distance x/c, noted in the results table and tube 35 is the static pressure of the wind tunnel. The dynamic pressure is given by a digital manometer. The digital readout results were used for all calculations because they are more precise. Results Raw data and calculated values for x/c, Cp and Cp(x/c) can be found in the appendix. Graphs of Cp against x/c for angles of attack -4, 7, and 15 degrees can be also be found in the appendix. These graphs determine the lift coefficient. Counting the squares method was used to determine the values of Cl. Graphs of Cp*(x/c) against x/c for angles of attack -4, 7, and 15 degrees can be also be found in the appendix. These graphs determine the pitch moment coefficient. Counting the squares method was used to determine the values of Cm. Graphs of Cl against angle of attack ,Cm against angle of attack, and Cm against Cl can be found in the appendix. Also below is a summary of the results: Angle of Attack (degrees) Cl Cm -4 -0. 513 0. 153 7 0. 740 -0. 166 15 0. 946 -0. 183 Discussion The experiment was conducted in a low speed, closed wind tunnel, operating at approximately 50% of its speed. The aerofoil was mounted in the wind tunnel and its pressure tapings connected to a manometer inclined at 30 degrees to the horizontal. The height of the liquid in each manometer tube represented the pressure acting on each of the aerofoil tapings. The pressure in the working section, and the pressure at the venturi inlet were taken into account, and a resulting wind tunnel velocity was displayed on a digital manometer. The Reynolds number was calculated (see appendix. Values of Cl and Cm for other angles of attack were obtained from other groups conducting the experiment, and were used to obtain more accurate graphs. It was also found that the slope of the Cl against angle of attack graph was 4. 4759, which was not relatively close to the theoretical value of 7. 105. The aerodynamic centre was calculated at 23. 7% of the chord length (from the slope of the Cm against Cl graph). It was found that the lift increased with angle of attack, up to a point where the aerofoil experiences stall, and a dramatic loss of lift occurs. As there was little change in the lower surface pressure distribution, the lift was mainly generated due to the upper surface suction. As the angle of attack increases, the height of the upper surface suction peak should increase, and move forward, indicating that the centre of pressure is moving forward. However, experimentally this was not prominent, and can be attributed to a possible disturbance in the pressure distribution around the aerofoil. At zero degrees angle of attack, for a symmetrical aerofoil, lift and Cm should equal zero. The reason that they were not zero means that the aerofoil must have had a very small angle of attack. The discrepancy between the theoretical and experimental value of lift curve slope is due to boundary layer effects, and the effect of the thickness of the aerofoil, and thus the theoretical value needs to be multiplied by the k value (=0. 917) to obtain the experimental result. Conclusion The aim of the experiment was achieved with a relatively good level of experimental accuracy. The pressure distribution over an aerofoil contributes towards the lift and pitching moment coefficient, where the increase in suction on the upper surface (due to an increased angle of attack) increases the lift, and pitching moment coefficient. The variation of pressure distribution also affects the location of the centre of pressure. The factors which affected the pressure distribution, were mainly the thickness and the Reynolds number. However, when it comes to comparing the results with their theoretical values it is clear to see that there have been significant errors have occurred in the experiment. These are listed below. Human errors in reading of the manometer tubes. Where several people were involved and this led to different techniques being used it would have been best for everyone to take their own set of readings and the average value calculated using all the data. The most common error without ant doubt was parallax and this could have been avoided by using digital measuring devices. Calculation errors i. e. rounding off, conversion error and error occurring when the area under the graphs was calculated for the coefficient of lift.   Experimental errors some of the tapping may have been defective and not enough tapping were provided. Also to obtain a better lift curve slope there should have more angles of attack. Also any obstructions in front of the wind tunnel such as people would create unnecessary turbulence inside the wind tunnel. Appendix Specimen Calculations.

How to Get Out of the Sophomore Slump

How to Get Out of the Sophomore Slump In your sophomore year in college? Feeling uninspired and unmotivated? You just might be in whats known as the college sophomore slump. For most students, its what happens during your second year of college: youre over the excitement of your first year but not close enough to graduating yet to be focusing on life after college. So whats a college student to do in the meantime? Take a Class for Fun You might be feeling slumpish because you are having to take tons of prereqs before you can get into the nice, meaty courses required for your major. Or you may not even be sure what to major in. Either way, add a little spice to your routine by taking a class just for fun. It can be yoga, ballet, an art class, or anything thats out of the ordinary for you. Join a New Club or Organization Your first year in school, you were probably so busy adjusting to life as a college student that your time management skills were shall we say less than stellar. But now that you know the ropes, join a new club or organization that will provide you with a creative outlet and something enjoyable to do each week. Get Involved in Student Government Even if youve never done student government before, see if you can represent your residence hall, your academic class, or even a constituency you belong to (like transfer students, for example). It can be a great way to keep you motivated to talk to other students, stay on top of current issues, and develop some leadership skills. (Not to mention that it looks good on your resume.) Volunteer on Campus No matter where you go to school, chances are that there is some kind of volunteer program you can join. See who needs volunteers this year and you just might end up motivating yourself along with others. Volunteer in the Local Community Maybe a change of scene is more whats needed. If so, see what volunteer options are available in your local community. Mentor First-year Students You just might be in the sophomore slump because you are doing well in college which means that perhaps you can be a good role model for incoming first-year students who need some guidance about adjusting to college life. See if your school has a mentoring program you can join and if not, see about starting one yourself! Get a Fun Job On Campus True, most students work in college for the money. But if you need to mix things up a little, this can be a great way to still get income while also enjoying yourself. Work in the campus coffee shop, at the theater, or in any other avenue that offers a fun, engaging environment. Get a Fun Job Off Campus Perhaps you do need a change of scene from your campus but dont have the time to volunteer. Try to combine both your financial needs and your need for change into an off-campus job that is interesting and something new. Get Involved Politically What are local politics like near your school? Can you volunteer on someones campaign? Join a national campaign for a person or an issue you care about? Become involved in a movement for a cause that is near and dear to your heart? Start Planning a Great Trip Sophomore year can be a little challenging because there often isnt one big thing to look forward to. So why not create your own highlight of the year? See what your options are for planning a fun trip over Thanksgiving break, winter break, spring break, or even a long weekend coming up. It just might do the trick of getting you out of your sophomore slump and back into your normal groove.

Biology Aqa

16. 8 – Genetic fingerprinting43 Section 9. 1 – Sensory Reception †¢ A stimulus is a detectable change in the internal or external environment of an organism that produces a response. The ability to respond to a stimulus increases an organism’s chances of survival. †¢ Receptors transfer the energy of a stimulus into a form that can be processed by the organism and leads to a response. †¢ The response is carried out by â€Å"effectors† which can include cells, tissues, organs and systems. Taxis – A simple response that’s direction is determined by the direction of the stimulus An organism can respond directly to a change in the environment by moving its body either: 1. Toward the stimulus (positive taxis) 2. Away from the stimulus (negative taxis) Kinesis – Results in an increase of random movements †¢ Organism does not move towards/away from the stimulus †¢ The more intense the stimulus the more rapid the movements †¢ Kinesis is important when the stimulus is less directional such as heat or humidity Tropism – a growth movement of part of a plant in response to a directional stimulus Positive phototropism – shoots/leaves Positive Geotropism – roots Section 9. 2 – Nervous Control Nervous organisation The nervous system can be thought of as having two main divisions: . The central nervous system (CNS) – brain and spinal cord 2. The peripheral nervous system (PNS) – Made up of pairs of nerves that originate either from the brain or the spinal cord The peripheral nervous system This is divided into: †¢ Sensory neurons which carry impulses away from receptors to the CNS †¢ Motor neurons which carry nervous impulses from the CNS to effectors The spinal cord is a column of nervous tissue A reflex – involuntary response to a stimulus (you do stop to consider an alternative) The pathway of neurons involved in a reflex is called a reflex arc. Reflex arcs contain just 3 neurons: 1. A sensory neuron 2. An intermediate neuron 3. A motor neuron There are several stages of a reflex arc: 1. Stimulus 2. Receptor 3. Sensory neuron 4. Synapse 5. Coordinator (intermediate neuron) 6. Synapse 7. Motor neuron 8. Effecter 9. Response Importance of the reflex arc †¢ Involuntary – does not require the decision making power of the brains †¢ Brain can override the response if necessary †¢ Protects the body from harmful stimuli Effective from birth – does not need to be learnt †¢ Short pathway – fewer synapses Synapses – slow Neurons – fast Section 9. 3 – Control of heart rate The Autonomic nervous system Controls subconscious activities of muscles and glands Has two main divisions: The sympathetic nervous system – Speeds up activities and thus allows us to cope with stressful situations (fight or flight r esponse) The parasympathetic nervous system – Inhibits effects and slows down activities. This allows energy to be conserved. Controls under normal resting conditions The two divisions are antagonistic meaning that their effects oppose one another Control of heart rate Changes of the heart rate are controlled by a region of the brain called the medulla oblongata which has two main divisions One division is connected to the sinoatrial node through the sympathetic nervous system The other is connected to the sinoatrial node via the parasympathetic nervous system Control by chemoreceptors Chemoreceptors are found in the wall of the carotid arteries and detect hanges in pH as a result of CO2 concentration When CO2 concentration in the blood is too low, chemoreceptors detect the drop in pH and send impulses to the section of the medulla oblongata responsible for increasing heart rate This section then increases the number of impulses sent to the S. A node via the sympathetic nervous system This results in an increase in heart rate which then causes blood pH to return to normal. Control by pressure receptors Pressure receptors occur in the wall of the carotid arteries and the aorta When blood pressure is too high – impulses are sent to the medulla oblongata which then sends impulses to the S. A node via the parasympathetic nervous system decreasing the heart rate When blood pressure is too low – impulses are sent to the medulla oblongata which then sends impulses to the S. A node via the sympathetic nervous system, increasing the heart rate Section 9. 4 – Role of receptors Features of sensory reception A sensory receptor will: †¢ Only respond to a specific type of stimulus (e. g. light, pressure, etc) †¢ Produce a generator potential by acting as a transducer. This means that it can convert the information to a form that the human body can interpret. This is achieved by using the energy of a stimulus into a nerve impulse called a generator potential. Structure and function of a pacinian corpuscle Responds to mechanical pressure Occurs in ligaments and joints so that it is possible to tell which direction a joint is changing The neuron of a pacinian corpuscle is in the centre of layers of tissue, each separated by gel The sensory neuron of a pacinian corpuscle has stretch-mediated sodium channels in its plasma membrane †¢ During its resting state, stretch-mediated sodium channels are too narrow to allow sodium through. The corpuscle therefore has a resting potential †¢ When pressure is applied, the membrane of the neuron is stretched causing sodium channels to widen therefore allowing sodium to diffuse into the neuron †¢ The influx of sodium ions cause a change in the polarity of the neuron, creating a resting potential †¢ The generator potential creates a action potential which moves along the neuron Receptors working together in the eye Different receptors respond to a different intensity of a stimulus Light receptors of the eye are found in the retina (the inner most layer) The light receptors in the eye can are of two types, rod and cone cells. Both receptors convert light energy into a nervous impulse and are therefore acting as transducers Rod cells Cannot distinguish between different wavelengths Many rod cells are connected to the same neuron and so can function at low light intensities. A threshold must be reached in the bipolar cells to which they are attached to and so since they can all contribute to reaching this threshold, they will function at lower light intensities Rod cells breakdown the pigment rhodopsin to generate an action potential. Rhodopsin is easily broken down in low light intensity Since more that one rod cell is connected to the same neuron, only one impulse will be generated. It is impossible for the brain to determine which rod cells were stimulate to begin with and so it is not possible to determine exactly the source of light This results in rod cells having a relatively poor visual acuity and so are not very effective in distinguishing between two points close together Cone cells There are three types of cone cells, each of which respond to a different avelength The colour interpreted depends of the proportion of each type of cone cell stimulated Cone cells are connected only to one bipolar cells, this means that they cannot combine to reach a threshold. As a result of this a high light intensity is required to create a generator potential Cone cells breakdown the pigment iodopsin to create a generator potential Iodopsin can only be broken down by a high light intensity Since cone cells are connected to a single bipolar cell, when two adjacent cells are stimulated, two separate nervous impulses will be sent to the brain. This means that it is easier to determine the source of the light. As a result, cone cells are responsible for higher visual acuity since they allow you to better distinguish between two points Light is concentrated by a lens to the centre of the eye called the fovea. This region receives a high light intensity and therefore has more cone cells. The peripheries of the eye receive a low light intensity and therefore consist mainly of rod cells. Section 10. 1 – Coordination Body systems cannot work in isolation and must therefore be integrated in a coordinated fashion. Principles of coordination In mammals, there are two main forms of coordination: 1. The nervous system – Uses nerve cells that can pass electrical impulses along their length. The result is the secretion of chemicals by the target cells called neurotransmitters. The response is quick, yet short lived and only acts on a localised region of the body. 2. The hormonal system – Chemicals are transported in the blood plasma which then reach target certain cells, thus stimulating them to carry out a function. The responses due to secretion of hormones often act over a longer period of time, yet are slower to act. Chemical mediators Nervous and hormonal forms of communication are only useful at coordinating the activities of the whole organism. At the cellular level they are complimented by chemical mediators. Chemical mediators are secreted by individual cells and affect other cells in the immediate vicinity. A common example of this type of coordination is the inflammation of certain tissues when they are damaged or exposed to foreign agents. Two examples of chemical mediators are: 1. Histamine – Stored in white blood cells and is secreted due to the presence of antigens. Histamine causes dilation of blood vessels, increased permeability of capillaries and therefore swelling the infected area. 2. Prostaglandins – Found in cell membranes and cause dilation of small arteries and arterioles. They release due to injuries and increase the permeability of capillaries. They also affect blood pressure and neurotransmitters. In doing so they relieve pain. Hormonal system |Nervous system | |Communication by chemicals |Communication by nervous impulses | Transmission takes place in the blood |Transmission is by neurons | |Transmission is generally slow |Transmission is very rapid | |Hormones travel to all areas of the body, but target only |Nerve impulses travel to specific areas of the body | |certain tissues/organs | | |Response is widespread |Response is localised | |Effect may be permanent/long lasting/ irreversible |Effect is temporary and reversible | Plant growth factors Plants respond to external stimuli by means of plant growth factors (plant hormones) Plant growth factors: †¢ Exert their influence by affecting growth †¢ Are not produced by a particular organ, but are instead produced by all cells †¢ affect the tissues that actually produce them, rather than other tissues in a different area of the plant. One plant hormone called indoleacetic acid (IAA) causes plant cells to elongate Control of tropisms by IAA IAA is used to ensure that plant shoots grow towards a light source. 1. Cells in the tip of the shoot produce IAA, which is then transported down the shoot. 2. The IAA is initial transported to all sides as it begins to move down the shoot 3. Light causes the movement of IAA from the light side to the shaded side of the shoot. 4. A greater concentration of IAA builds up on the shaded side of the shoot 5. The cells on the shaded side elongate more due to the higher concentration of IAA 6. The shaded side of the root therefore grows faster, causing the shoot to bend towards the source of light IAA can also effect the bending of roots towards gravity. However in this case it slows down growth rather than speeds it up. IAA decreases root growth and increases shoot growth Section 10. 2 – Neurons Specialised cells adapted to rapidly carry electrochemical changes (nerve impulses) from part of the body to another Neuron structure Cell body †¢ Nucleus †¢ Large amounts of rough endoplasmic reticulum to produce neurotransmitters Dendrons †¢ Extensions of the cell body sub-divided into dendrites †¢ Carry nervous impulses to the cell body Axon †¢ A single long fibre that carries nerve impulses away from the cell body Schwann cell †¢ Surrounds the axon †¢ Protection/electrical insulation/phagocytosis. Can remove cell debris and are associated with nerve regeneration. Myelin sheath †¢ Made up from the Schwann membrane which produces myelin (a lipid) †¢ Some neurons are unmyelinated and carry slower nerve impulses Nodes of Ranvier †¢ The gaps between myelinated areas †¢ 2 – 3 micrometers long and occur every 1 – 3mm Sensory Neuron †¢ Transmit impulses from a receptor to an intermediate neuron or motor neuron †¢ One Dendron towards the cell body, one axon away from the cell body Motor neuron †¢ Transmit impulses from the sensory/intermediate neuron to an effector †¢ Long axon, many short dendrites Intermediate neuron †¢ Transmit impulses between neurons †¢ Numerous short processes Section 10. 3 – The nerve impulse A nerve impulse is not an electrical current! It is a self-propagating wave of electrical disturbance that travels along the surface of an axon membrane. Nerve impulse – temporary reversal of the electrical p. d across an axon membrane The reversal is between two states The resting potential no nerve impulse transmitted The action potential – nerve impulse transmitted Resting potential †¢ Sodium/potassium are not lipid soluble and cannot cross the plasma membrane. Transported via intrinsic proteins – ion channels †¢ Some intrinsic proteins actively transport potassium ions into the axon and sodium ions out. This is called the sodium potassium pump. Sodium potassium pump 3 sodium ions pumped out for every 2 potassium ions pump in †¢ Most gated potassium channels remain open – potassium ions move out of the axon down their chemical gradient †¢ Most gated sodium channels remain closed The action potential †¢ Temporary reversal of the charge of the membrane from (-65mV to +65mV). When the p. d is +65mV the axon is said to be depolarised †¢ Occurs because the ion channels open/close depending upon the voltage across the membrane †¢ When the generator potential is reached, sodium ion channels open and potassium close, allowing sodium to flood into the axon. Sodium being positively charged causes the axon to become more positive in charge The passage of an action potential along an unmyelinated axon †¢ Stimulus – some voltage – gated ion channels open, sodium ions move in down electrochemical gradient †¢ Causes more sodium channels to open †¢ When the action potential reaches ~ +40mV sodium channels close †¢ Voltage – gated potassium channels open and begin repolarisation of the axon Hyper – polarisation †¢ The inside of the axon becomes more negative than usual due to an â€Å"overshoot† in potassium ions moving out of the axon. †¢ Potassium channels close †¢ Sodium potassium pump re-established the -65mV resting potential Section 10. 5 – The speed of a nerve impulse Factors affecting speed 1. The myelin sheath – Prevents the action potential forming in myelinated areas of the axon. The action potential jumps from one node of Ranvier to another (salutatory conduction) – this increases the speed of the impulse as less action potentials need to occur 2. The greater the diameter of the axon the greater the speed of conductance – due to less leakage of ions from the axon 3. Temperature – Higher temperature, faster nerve impulse. Energy for active transport comes from respiration. Respiration like the sodium potassium pump is controlled by enzymes. Refractory period After an action potential, sodium voltage-gated channels are closed and sodium cannot move into the axon. It is therefore impossible during this time for a further action potential to be generated. This time period, called the refractory period serves two purposes: It ensures that an action potential can only be propagated in one direction – An action potential can only move from an active region to a resting region. It produces discrete impulses – A new action potential cannot be generated directly after the first. It ensures action potentials are separated from one another. It limits the number of action potentials – action potentials are separated from one another, therefore there is a limited amount that can pass along a neuron in a given time. All or nothing principle Nervous impulses are all or nothing responses A stimulus must exceed a certain threshold value to trigger an action potential A stimulus that exceeds the threshold value by a significant amount, will produce the same strength of action potential as if it has only just overcome the threshold value A stimulus can therefore only produce one action potential An organism can perceive different types of stimulus in two ways: The number of impulses in a given time (larger stimulus, more impulses per second) Having neurons with different threshold values – depending on which neurons are sending impulses, and how frequently impulses are sent, the brain can interpret the strength of the stimulus Section 10. 6/10. 7 – Structure and function of the synapse / Transmission across a synapse A synapse occurs where a dendrite of one neuron connects to the axon of another Structure of a synapse Synapses use neurotransmitters to send impulses between neurons The gap between two neurons is called the synaptic cleft The neuron that produces neurotransmitters is called the presynaptic neuron The axon of the presynaptic neuron ends in a presynaptic knob The presynaptic knob consists of many mitochondria and endoplasmic reticulum These organelles are required to produce neurotransmitters which are stored in synaptic vesicles Synaptic vesicles can fuse with the presynaptic membrane releases the neurotransmitter Functions of synapses †¢ A single impulse from neuron can be transmitted to several other neurons at a synapse. This means that one impulse can create a number of simultaneous responses †¢ A number of different impulses can be combined at a synapse. This means that several responses can be combined to give on single response Neurotransmitters are made in the presynaptic cleft only When an action potential reaches the presynaptic knob, it causes vesicles containing the neurotransmitter to fuse with the presynaptic membrane The neurotransmitter will the diffuse across the synaptic cleft The neurotransmitter then bind with receptors on the postsynaptic membrane, in doing so generating a new action potential in the postsynaptic neuron Features of synapses Unidirectionality Impulses can only be sent from the presynaptic membrane to the postsynaptic membrane Summation †¢ Spatial summation Different presynaptic neurons together will release enough neurotransmitter to exceed the threshold value to form an action potential †¢ Temporal summation – One neuron releasing neurotransmitter many times over a short period. Eventually the neurotransmitter will accumulate so as to overcome the threshold value of the postsynaptic membrane. Therefore generating a new action potential Inhibition Some postsynaptic membranes have protein channels that can allow chloride ions to diffuse into the axon making it more negative than usual at resting potential. This type of hyperpolarisation inhibits the postsynaptic neuron from generating a new action potential. The importance of these inhibitory synapses is that it allows for nervous impulses to be controlled and stopped if necessary Transmission across a synapse When the neurotransmitter across a synapse is the chemical acetylcholine it is called a cholinergic synapse Acetylcholine is made up of acetyl (ethanoic acid) and choline Cholinergic synapses are more common in vertebrates Cholinergic synapses occur in the central nervous system and at neuromuscular junctions 1. When an action potential reaches the presynaptic knob, calcium channels open allow calcium to diffuse into the presynaptic knob 2. The influx of calcium ions causes presynaptic vesciles containing acetylcholine to fuse with the presynaptic membrane, releasing the neurotransmitter into the synaptic cleft 3. Acetylcholine diffuses across the cleft and fuses with receptor sites on sodium channels found on the presynaptic membrane. When they do so, the sodium channels open, allowing sodium ions to diffuse along their concentration gradient into the postsynaptic knob. 4. The influx of sodium ions, generates a new action potential in the postsynaptic neuron 5. Acetylcholinesterase hydrolyses acetylcholine back into the acetyl and choline which will the diffuse back across the synaptic cleft into the presynaptic neuron. In this way acetylcholine can be recycles and reused and also is prevented from continuously generating new action potentials on the postsynaptic neuron. 6. ATP is released by mitochondria, providing energy to recombine acetyl and choline. Sodium channels on the postsynaptic membrane are now closed due to the absence of acetylcholine attached to receptor sites. Section 11. 1 – Structure of skeletal muscle There are three types of muscle in the body: Cardiac muscle which is found only in the heart Smooth muscle which is found in the walls of blood vessels Skeletal muscle which is attached to bone and is the only type of muscle under conscious control Muscles are made up of many muscle fibres called myofibrils If the cells of muscles were joined together from the end of one cell to another, the point between cells would be a point of weakness Because of this, the muscle cells are fused together into muscle fibres Cells of the same myofibrils share the same nuclei as well as cytoplasm (sarcosplasm). Within the sacroplasm are many mitochondria as well as endoplasmic reticulum Microscopic structure of skeletal muscle Myofibrils are made up of two types of protein filament Actin – thinner, consists of two strands twisted around each other Myosin – thicker and is made up of long rod shaped fibres with bulbous heads projecting outwards Myofibrils have coloured bands The isotropic (I) bands appears lighter since it consists only of actin (no overlap) The anisotropic (A) bands are darker since this is where acting and myosin overlap The H zone is the region in the centre of the sarcomere that is lighter in colour since there is only myosin The z line lies at the centre of the I bands Types of muscle fibre Slow-twitch fibres – Contract more slowly, less powerful. Adapted for endurance/aerobic respiration so less lactic acid forms Adaptations include: Large store of myoglobin, Supply of glycogen, Rich supply of blood vessels, Numerous mitochondria Fast-twitch – Contracts more rapidly with more power but only for a short period of time. Adapted for intense exercise by: Having hicker and more numerous myosin filaments, having a high concentration of enzymes used for anaerobic respiration, a large store of phosphocreatine to provide phosphate to make ATP Neuromuscular junctions Many neuromuscular junctions are spread through the muscle for simultaneous contraction Each muscle fibre has one motor neuron associated with it. The muscle fibre and the neuron make up one motor unit When only a small force is needed only a few motor units are stimulated When a nerve impulse reaches the neuromuscular junction, the synaptic vesicles join with the presynaptic membrane and release acetylcholine which diffuses across to the postsynaptic membrane and stimulates it to allow sodium ions to enter. The acetylcholine is then broken down by Acetylcholinesterase and then diffuses back into the presynaptic neuron. Section 11. 2 contraction of skeletal muscle During muscle contract, actin and myosin slide past each other; hence its name the sliding filament mechanism Evidence for the sliding filament mechanism When a muscle contract, the following changes occur to the sarcomere: The I band becomes narrower The z lines move close to one another The h band becomes narrower The a band does not change as this band is determined by the width of the myosin Myosin is made up of two different types of protein 1. A fibrous protein arranged into the filament called the tail 2. A globular protein that forms a head at each end Actin is a globular proteins thats molecules are arranged into two chains that twist around each other in a helical manner Tropomyosin forms long thin stands that s wound around the actin molecule The process of muscle contraction has a three main stages: Stimulation, contraction and relaxation Muscle stimulation When an action potential reaches the neuromuscular junctions, Calcium ion channels open and calcium ions move into the synaptic knob The Calcium ions cause the synaptic vesicles to move to the presynaptic membrane and fuse with it releasing acetylcholine Acetylcholine diffuses across the synaptic cleft and binds with receptors on the sodium voltage gated channels on the postsynaptic membrane causing it to depolarise Muscle contraction The action potential movies through the fibres by travelling through T – tubules that branch through the sarcoplasm The action potential moves through the tubules until it reach the sarcoplasmic reticulum The action potential opens calcium ions in the sarcoplasmic reticulum Calcium ions diffuse out into the muscle Calcium ions cause tropomyosin to change shape and so that the binding sites on the actin filament are exposed An ADP molecule that is attached to the myosin heads allows it to form a cross bridge with actin by binding with the receptor site Once the cross bridge is formed, the myosin head changes shape and slides the actin across. In doing so it loses the ADP An ATP molecule attaches to the myosin head and thus causes it to detach Calcium ions activate the enzyme ATPase which hydrolyses ATP and releases energy that allows the myosin head to resume its original shape. The myosin head now has a new ADP molecule that will allow it to bind with a new receptor site somewhere along the actin filament Muscle relaxation When the muscle is not being stimulated, the sarcoplasmic reticulum actively transport calcium ions back into it The lack of calcium ions means that tropomyosin can establish its original position, covering the myosin head binding sites Energy supply Energy is needed for the movement of myosin heads and the active transport of calcium ions ATP often needs to be generated anaerobically Phosphocreatine provides inorganic phosphate molecules to combine with ADP to form ATP Section 12. 1 – Principle of homeostasis The maintenance of a constant internal environment By maintaining a relatively constant environment (of the tissue fluid) for their cells, organisms can limit the external changed these cells experience thereby giving the organisms a degree of independence. What is homeostasis? Maintaining the volume, chemical make up and other factors of blood and tissue fluid within restricted limits There are continuous fluctuations; however, they occur around a set point Homeostasis is the ability to return to that set point thus maintaining equilibrium The importance of homeostasis Enzymes and other proteins are sensitive to changes in pH and temperature Water potential of blood and tissue fluid should be kept constant to ensure cells do not burst or shrink due to a net movement of water (osmosis) Maintaining a constant blood glucose concentration ensures that the water potential of the blood remains the same Independence of the external environment – a wider geographical range and therefore a greater chance of finding food shelter, etc Mammals – homeostasis allows them to tolerate a wide range of conditions Control mechanisms The set point is monitored by: 1. Receptor 2. Controller brain analyses and records information from a number of different sources and decides on the best course of action 3. Effector – brings about the change to return to set point 4. Feedback loop – informing the receptor of the changes in the system brought about by the effector Section 12. 2 Thermoregulation Mechanisms of heat loss and gain Production of heat – Metabolism of food during respiration Gain of heat from the environment – Conduction, convection (surrounding air/fluid), Radiation (electromagnetic waves particularly infrared) Mechanisms for losing heat Evaporation of water Conduction – to ground/solid Convection convection (to surrounding air/fluid), Radiation Endotherms derive most heat energy from metabolic activities Ectotherms – obtain most heat from the external environment Regulation of body temperature in Ectotherms Body temp fluctuates with the environment Controlled by exposure to the sun Shelter to the sun/burrows at night/obtains heat from the ground and very little from respiration. Can sometimes change colour to alter heat that is radiated Regulation of body temperature in Endotherms Most heat gained through internal metabolic activities Temperature range 35 – 44 oC – Compromise between higher temperature where enzymes work more rapidly and the amount of energy needed (hence food) to maintain that temperature Conserving and gaining heat in response to a cold environment Long term adaptations: Small SA:V ration Therefore mammals and birds in cold environments are relatively large Smaller extremities (e. g. ears) thick fur, feathers or fat reserves to insulate the body Rapid changes: Vasoconstriction – reducing the diameter of arteries/arterioles Shivering – in voluntary rapid movements and contractions that produce he energy from respiration Raising hair – enables a thick layer of still air to build up which acts as a good insulator. Behavioural mechanisms – bathing in the sun Decreased sweating Loss of heat in response to a warm environment Long term adaptations: Large SA:V ratio so smaller animals are found in warmer climates Larger extremities Light coloured fur to reflect heat Vasodilation – Arterioles increase in diameter, more blood reaches capillaries, more heat is therefore radiated away Increased sweating – Heat energy is required to evaporate sweat (water). Energy for this comes from the body. Therefore, removes heat energy to evaporate water Lower body hair – Hair erector muscles relax. Hairs flatten, reduces the insulating layer of air, so more heat can be lost to the environment Behavioural mechanisms – seeking shade, burrows, etc Control of body temperature Mechanisms to control body temperature are coordinated by the hypothalamus in the brain The hypothalamus has a thermoregulatory centre divided into two parts: A heat gain centre which is activated by a fall in body temperature And a heat loss centre which is activated by an increase in temperature The hypothalamus measures the temperature of blood passing through it Thermoreceptors in the skin also measure the temperature Impulses sent to the hypothalamus are sent via the autonomic nervous system The core temperature in the blood is more important that the temperature stimulating skin Thermoreceptors Section 12. 3/12/4 – Hormones and the regulations of blood glucose/Diabetes and its control Hormones are produced by glands (endocrine glands) which secrete the hormones into the blood The hormones are carried in the blood plasma to the target cells to which they act. The target cells have complementary receptors on the cell surface membrane Hormones are affective in small quantities set have widespread and long-lasting affects Some hormones work via the secondary messenger model: 1. The hormone (the first messenger) binds to receptors on the cell surface membrane, forming a hormone-receptor complex 2. The hormone-receptor complex activates an enzyme inside the cell that produces a secondary messenger chemical 3. The secondary messenger acts within the cell produces and a series of changes Both glucagon and adrenaline work by the secondary messenger model Adrenaline as a secondary messenger 1. The hormone adrenaline forms a hormone-receptor complex and therefore activates an enzyme inside the cell membrane 2. The activated enzyme the converts ATP to cyclic AMP which acts as the secondary messenger.

Discuss how authors critique gender roles in thire noveles Season of Essay

Discuss how authors critique gender roles in thire noveles Season of Migration and Beer in the snooker club - Essay Example Salih writes about characters from poorer parts of northern Sudan while Ghali writes about city people in Egypt. The main characters in both of these books are male. The men in the books also meet a number of women and from time to time there is discussion of gender relations in British society and in their homeland also. Contact with Western society, and with London in particular, makes the authors think about potential changes to local family and social relationships, and especially to gender roles. In the first novel it is quite difficult to work out what the author’s views on the topic of gender are, because the male narrator has quite a different perspective from the other main character, Mustafa Sa’eed. The village in which they meet is rather traditional which means that life runs on the basis of Islamic law. The narrator describes his family, with emphasis on his grandfather who is a good male role model for him. There are also a number of elderly males who make a lot of sexist jokes about women. One of these characters, Wad Rayyes, seems to represent the dominant view : ‘He had been much married and much divorced, taking no heed of anything in a woman except that she was a woman, taking them as they came, and if asked about it replying â€Å"A stallion isn’t finicky†.’ (Salih: 66) The narrator observes this behaviour and repeats the animal comparison when he says (Salih: 81) â€Å"Wad Rayyes, who charged women as he charged donkeys†. This kind of womanizing behavior is also displayed by Mustafa Sa’eed who goes after several different British women when he is in London. He actually marries Jean Morris and she compares him to â€Å"a savage bull that does not weary of the chase† (Salih: 33). The fact that Sa’eed kills Jean Morris and drives several of his lovers to suicide underlines the aggression that this character feels in his romantic relationships. At one point Sa’eed describes his bedroom in

Eating Habits of College Students Research Paper

Eating Habits of College Students - Research Paper Example Also, it demonstrates how adequate understanding of consequences of poor eating habits can improve the health of the students and the entire nation. 1. Research question(s), rationale and qualifications, This study aims to answer various issues relating to eating habit of the college students. For example, how does food quality of campus cafe affect eating habits of the college student? What factors influence the eating habit of the college students? Is there a relationship between campus life and eating students eating habit? Does poor eating habit among the college students have any effect on their health? What is the link between the level of health dietary awareness and students eating habit? 2. Outcomes and impact The rate of overweight and obesity in the United States has been rising at an alarming rate as well as the prevalence of lifestyle diseases such as cardiovascular, diabetes and so on. Various studies have shown that the most affected population are those between the age of 18 and 29 years, and an unfortunate majority of these are the college, students. Also, about 36% of the college students are either overweight or obese (Farrell, 2010). The menace of overweight or obesity among the college students has been contributed by unhealthy eating habits. The college environment has also made a significant influence on the eating habits of the students because of the availability of large portions of high calorie and fat foods as well as buffet style cafeteria (Deshpande et al., 2009).

Public Honor vs. internal virtue Essay Example for Free

Public Honor vs. internal virtue Essay History has presented two different types of honor that have both been highly acceptable in their respective cultures. Christianity and the Bible put a great deal of emphasis on personal virtue, where one worries about themselves and not really anything else. This is in direct contrast to other cultures, however, where public virtue is a much more important part of society. In the play Julius Caesar, society rewards people who keep the whole in mind as opposed to keeping self in the most important place. The clash between public virtue and internal virtue is one that has created a personal struggle for many men in both of these societies, as well as in today’s society.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   In the Bible, those who followed Jesus Christ were urged to practice personal virtue, as opposed to overall public virtue. Even Jesus himself was a living example of this. He was known to go against the flow and in fact, that is what eventually got him crucified. He went through his life preaching his principles, which directly clashed with what the religious elders were telling people at the time. This goes against public virtue, because it caused a ruckus within society and shook up the order that was currently working in society. That was unimportant to Jesus Christ, though, as his main focus was on internal purity as opposed to looking out for the greater good. Still, his work did go towards the greater good, though. That is the interesting paradox that exists within this example. Though Christ’s primary focus was on internal virtue, the overall body of his work was highly focused on public virtue. This could not be evaluated until his work on earth was finished, though, as from the surface, it appeared that Christ was a divider, instead of a person who brought people together for the pursuit of a great good.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   A direct clash can be found if one looks at a story like Julius Caesar. Caesar was a leader that was loved by the majority of his people for the majority of his time in office. Eventually, he had to be taken down, though. He was not doing things as the leader of Rome that needed to be done in order to ensure that the people of that area had a fair shake. Because they knew this, the members of the Roman Senate like Brutus and Marc Anthony took it upon themselves to take action. They did not focus on doing the thing that was â€Å"right†, in regards to their own personal virtue. Instead, they threw aside those personal considerations in order to do something for the greater good of society at large. They assassinated Caesar in the most brutal manner possible in order to protect the people of Rome. In the time of Jesus, this would have been looked upon with a great deal of disgust, even though they were actually doing something good for society. Since they would have committed a personal wrong, basic Christian values would not have looked kindly upon their actions. In Roman society, where public virtue was given precedence over internal virtue, they were heroes, though. Brutus was a murderer by definition, but history looks upon him as a sympathetic and heroic figure. This speaks primarily to the differences in philosophy that existed during the two eras.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   These two examples are important to understanding the clash that existed between the two ideas. For the most part, each era of time allows for only one of these theories when it comes to judging major events. It is very difficult for people to keep their internal virtue, while also doing something that exhibits public virtue. Instead, a choice must be made between the two. People must decide if they want to keep their own internal sanctity or do that which will benefit society at large. In the case of Jesus Christ, the internal virtue overcame any consideration of public virtue because the teachings of the Bible made it that way. The time of Julius Caesar and Brutus was ruled by a different code, so history looks kindly on his actions in their scope. This interesting paradox clearly shows how different societies view different actions in regards to their moral â€Å"goodness†.   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   Internal virtue and public virtue are two very different ideas that were accepted in two very different times. Today’s society seems to have an understanding for both, whereas other times would only allow for one or the other. Today, respect can be found for people who keep the greater good in mind when they take action. By contrast, those people who do what is right for themselves seem to get places in today’s society, as well. The clash between the two is not nearly as strong or nearly as distinct today as it once was. Still, there are times when people have to make a choice between the two types of virtue and in those times, the choice can dictate how history views their action.

Free Essays - Anne Frank :: Anne Frank

The Franks were your general German family and Anne was your general German girl. This family of four lived in Germany, Mr. Frank was an average business man, Mrs. Frank was an average mother and Margot and Anne were average students. The one thing that made them different in the eyes of Hitler, was the fact that they were Jewish. Once Hitler rose to power, the Franks fled to Holland, where the hoped to be safe from the Jewish-blood thirsty Nazis, they went on with their normal lives, until once again Hitler took over. This caused the Franks to flee again, only this time they would be in hiding. A plan was devised; the Franks would stay in an abandoned section of the Kraler office building, along with another family of three: the Van Daans. The Franks set off for their new "home" before the Van Daans. They had to carry with them things that would last for as far as they knew, years. Anne took with her two vests, three pairs of pants, a dress and skirt, jacket, summer coat, shoes, two pairs of stockings, a cap and a scarf. During the journey through the streets, non-jews looked at them with pity and sorrow, they knew that there was nothing they could do to help them, no rides, no food, no help period. Once they arrived to what they called, the "Secret Annexe" they set their things in their rooms. Anne decorated her wall with all of her favorite actors and actresses. About a week later the Van Daans joined them, Mrs. Van Daan brought with her, her "chamber" Mr. Van Daan brought a folding tea table and Peter brought his cat Mouschi. Each of them had their own individual personality, Mr. Van Daan, was pretty mellow with most of the Franks, especially Margot, but often had a word or two to say about Anne, he didn't like her constant chattering. Mrs. Van Daan was loud and flirtatious, constantly pestering people and never willing to do her part of the work around the Annexe. Then there's Peter, the quiet, dull and boring one. At first Anne cannot stand Peter's laziness, but she later grows quite fond of him. As time goes on, they each get to know each other a little better, Miep brings them news from the outside world as often as she can along with some small amounts of rations. Free Essays - Anne Frank :: Anne Frank The Franks were your general German family and Anne was your general German girl. This family of four lived in Germany, Mr. Frank was an average business man, Mrs. Frank was an average mother and Margot and Anne were average students. The one thing that made them different in the eyes of Hitler, was the fact that they were Jewish. Once Hitler rose to power, the Franks fled to Holland, where the hoped to be safe from the Jewish-blood thirsty Nazis, they went on with their normal lives, until once again Hitler took over. This caused the Franks to flee again, only this time they would be in hiding. A plan was devised; the Franks would stay in an abandoned section of the Kraler office building, along with another family of three: the Van Daans. The Franks set off for their new "home" before the Van Daans. They had to carry with them things that would last for as far as they knew, years. Anne took with her two vests, three pairs of pants, a dress and skirt, jacket, summer coat, shoes, two pairs of stockings, a cap and a scarf. During the journey through the streets, non-jews looked at them with pity and sorrow, they knew that there was nothing they could do to help them, no rides, no food, no help period. Once they arrived to what they called, the "Secret Annexe" they set their things in their rooms. Anne decorated her wall with all of her favorite actors and actresses. About a week later the Van Daans joined them, Mrs. Van Daan brought with her, her "chamber" Mr. Van Daan brought a folding tea table and Peter brought his cat Mouschi. Each of them had their own individual personality, Mr. Van Daan, was pretty mellow with most of the Franks, especially Margot, but often had a word or two to say about Anne, he didn't like her constant chattering. Mrs. Van Daan was loud and flirtatious, constantly pestering people and never willing to do her part of the work around the Annexe. Then there's Peter, the quiet, dull and boring one. At first Anne cannot stand Peter's laziness, but she later grows quite fond of him. As time goes on, they each get to know each other a little better, Miep brings them news from the outside world as often as she can along with some small amounts of rations.

What Is Jcaho & What Role Does It Play in the Current Healthcare System-Is It Necessary

Shakespeare Sance Homework # 4 The factors that would cause the lung to collapse are elastic recoil and high surface tension. And the factors that prevent the lungs from collapse are negative intrapulmonary pressure and surfactant. During expiration : volume increase and pressure decrease During inspiration : volume decrease and pressure increase The role of surfactant is to decrease surface tension by more than 40 times. And it's effect on surface tension is to prevent them from PO2 in alveolar : 104PO2 in venous blood : 40 PO2 in atmosphere : 160 PO2 in arterial : 100 PO2 in expired : 120 PO2 in inspired : 160 Co2 is 20 times more soluble in water than oxygen Anatomical dead space : the section where there is no gas exchange Physiological dead space : the sum of anatomical dead space and alveolar Dead space And it would only increase if a person is sick for example suffering from asthma . Compliance in respiratory care: how much stretch you have how much changes in pressure natural ly the lungs have a high compliance .Low compliance : pulmonary edema and cystic fibrosis High compliance : emphysema : where a person can get air in and can't get it out O2-Hb dissociation curve:when the curve mov to the right there is less saturation of hemoglobin . When is shift to the left less oxygen release more oxygen bound to hemoglobin. Situations that would cause more o2 to release are high temperature, low PH , exercise , high co2. Way O2 are transport: hemoglobin and plasmaWay CO2 are transport : plasma , bicarbonate ion , and carbamino-compounds Chloride shift : exchange of bicarbonate for chloride across the red blood cell The role of the phrenic nerve : excite the diaphragm and intercostal muscles , causing breathing movements. Anatomy respiratory membrane: a simple layer of squamous epithelial of alveolus and a simple layer of squamous epithelial of the capillary very thin, together the alveolar and capillary walls and their fused basement membranes form the respirat ory membrane.Increase in thickness of the respiratory membrane would decrease gas exchange or imputed gas exchange. Inspiratory center: comparable to the SA node this center sets the rhythmicity of respiration by spontaneously depolarizing and stimulating the phrenic nerve to cause inspiration. Expiratory center: it's caused as the inspiration center no longer stimulate the diaphragm stop expiratory allows us to respirate. Pneumotaxic center: this center inhibits the inspiratory center to limit the period of inspiration.Damage to the pneumotaxic center may cause prolonged inspirations. Apneustic center: this center stimulates the inspiratory center and is usually inhibited by the pneumotaxic center. Cortical nephron: has short loop of henle and glomerelus further from the corticomedullary junction. efferent arteriole supplies peritubular capillaries Justamedullary nephron: has long loop of henle and glomerulus closer to the corticomedullary junction. efferent arteriole supplies vasa recta.The filtration membrane: basement membrane, podocytes, and glomerular endothelium Pressure forces fluid out the glomerulus: glomerular blood hydrostatic pressure Force oppose fluid to move out : blood colloid osmotic pressure Afferent vasodilate: blood flow increase , blood pressure increase and GFR increase Efferent vasodilate: blood flow decrease, blood pressure decrease and GFR decrease Afferent vasoconstriction: blood flow decrease, blood pressure decrease and GFR decrease. Efferent vasoconstriction: blood flow increase , blood pressure increase and GFR increase.The role of renin is to cut angiotensinogen to angiotensin 1 and it's secreted when there is sense of low blood pressure. Everything that are reabsorbed back into the blood has tubular maximum and you exceed the T max , the exceed remind in the urine. The major hormones that regulates potassium secretion is aldosterone Acidosis: PH under 7. 35 Alkalosis: PH over 7. 45 PH: measures free hydrogen ions range from 0 t o 14 there is an inverse relationship between hydrogen ions and PH as hydrogen ion goes up PH went down Three majors ways to buffeting urine : chemical buffer system, bicarbonate buffer system and protein buffer system.Hypoventilation : PH went down Hyperventilation : PH goes up ECF: fluid inside the cell ICF : fluid outside the cell More sodium ECF than ICF More potassium ICF than ECF Countercurrent system: fluid flowing in parallel tubes in opposite direction And you will find one at the They shouldn't no red blood , protein , bile pigment and no glucose Intense SNS no urine Little SNS blood pressure goes up GFR goes up PSNS : more urine Sensible : sweat you can actually see they are hypotonic and has electrolytes Insensible : sweat you don't see come from your skin and you ears .

To What Extent Should We Trust Our Senses to Give Us the Truth

To what extent should we trust our senses to give us the truth? Most of the things we know are based on a life-long series of observations and experiments through our own senses. Without our senses, social interactions and critical thinking would be impossible, leaving us only with inexplicable emotions, a close state to nothingness. Despite its significance, however, our senses have limitations ranges from our dependency to language to our own biological limitations. Human beings are inherently provided with these inevitable limitations.We therefore, as well-educated individuals, must not completely trust our senses as it can easily be deceived. Our dependence on language distorts what our senses are truly getting. In a simple context of analyzing an art piece, for instance in the process of analyzing the nuance of the work, our interpretations of what we see tend to be bounded with the language that we know. Without the use of language, in this context, the art piece will remain ab stract in our mind. The emotions that we get from viewing the art piece, for example, can be described with adjectives.In a wider sense, language influences the way we think. I have encountered an experience where my short eyesight (I need glasses to see â€Å"normally†) gave a misleading account to an event. I was in an art convention center with my friend; the place was covered with a realistically structured fake plastic trees. It was part of the art works being exhibited. In the end of the expo I said to my friend, â€Å"Nice right! Such great pieces of art shown there! Especially the trees, how on earth can they grow it to form such structure†.My friend, whose vision is â€Å"normal†, told me that it the trees were forgeries. I wasn't using my glasses at the moment, If I was then I would've reacted differently. Biological capabilities limit what we are able to sense and perceive. There are still many factors such as spacial familiarity, past experience; our tendency to see or hear what we expect rather than what really happen; optical illusions or social and cultural conditioning that aren’t being discussed, but also a limitation of our senses.Although with the chance of getting false knowledge, what important is that we develop critical thinking skills to distinguish between good and bad reasoning. Examining our own perspectives, using our own senses perhaps, and comparing them to those of others and to see what we learn from it is what important rather than abstaining from the pursuit of knowledge due to the limitations of our senses.

How to Use Facebook Retargeting Ads With Nick Steeves [PODCAST]

How to Use Facebook Retargeting Ads With Nick Steeves [PODCAST] It’s a challenge to get traffic to your website. Even after you put in the effort to build traffic, many visitors don’t buy what you’re selling the first time they visit. What you want to do is get your visitors to return so they make that purchase. Today’s guest is Nick Steeves, the chief product officer at Wishpond. He is going to talk to us about retargeting, video ads, and how to measure your digital advertising success. If you want to get more people to come back to your site to buy your product or service, you won’t want to miss today’s show! Information about Wishpond and what Nick does there. Retargeting: What it is and why it’s important. Nick also talks about two ways to do retargeting one way that is basic and one way that is more advanced. How Wishpond comes up with retargeting ad ideas. The types of retargeting ads that work the best for Display and Facebook. Tips on making great videos that will result in conversion. Why it makes good business sense to â€Å"pay to play† on Facebook. Why Wishpond calls their marketing team â€Å"the growth team.† What the Wishpond growth team’s workflow looks like and how they keep it all organized. How to test ads to know what works best, as well as what to look for to know whether the ad is working or not working and how to learn from the ads that just didn’t work. Nick’s best advice for someone just starting out with retargeting ads. Links: Nick Steeves Wishpond AdEspresso Google AdWords

Business Opportunities in Food and Beverage Industry Essay

Business Opportunities in Food and Beverage Industry - Essay Example Food is a very defining element of a culture. Eating different kinds of foods does more than just satiating the craving for taste; it provides a greater insight into other cultures. This paper discusses a business idea of establishing a South Asian Tea Restaurant in New York. Americans generally like the South Asian foods a lot. â€Å"one should not be surprised if a seven-year-old American kid walks up and asks for aloo mater samosas and his mom is keen on having the complimentary chai† (Deccan Chronicle, 2013). Popular food items include but are not limited to samosas, pakoras, halwa poori, murgh cholay, and lassi. These foods are not only very tasty, they also have a high nutritious value since they are all made from natural products and do not include the use of any preservatives or chemicals that is a big plus point. â€Å"Everything is made right there, even the samosas(no frozen boxed samosas here), pakoras, and chutneys(not jarred like most places serve) are all made fresh here and delicious† (Justin, 2013). The fundamental purpose of establishing any business is to make money. Most of these food items are extremely cheap to make and yet sell for a very large price primarily because of their nutritional value, their exceptional taste, their exotic looks, and their cultural affiliations. Even more, when these food items are made in bulk, they become all the cheaper to make and more profitable to sell at the same time. At a famous Indian restaurant, â€Å"While Samosa and Idli Sambar are available for $5.50, one has to spend $7 for Masala dosa and $7.5 for two pieces of gulab jamun† (First Post, 2012). Considering the ingredients used in the making of a samosa, one samosa might cost the owner no more than $0.15. Comparison of this to the amount it sells or provides evidence of the profitability of the business. The other food items are similarly cheap but with a huge profit margin. It takes careful planning and strategy to establish s uch a business at the right point. The owners should look for an area where the population of South Asians is relatively higher as compared to other regions in America since the prime consumers of this business are people from such countries as Pakistan, India, and Bangladesh. Such areas are not hard to find since most of these families tend to live together in neighborhoods since they have common cultural values and find one another helpful in America. In order to have an edge over other such restaurants, the owners need to pay special attention toward ambiance. Songs of old legendary singers like Noor Jehan, Lata, Rafi, Mukesh, and Kishore can provide the place that extra boost that it requires to appeal massive in-pour of consumers. South Asians mostly like to have samosas and pakoras with tea during the lunch breaks and as snacks, so these items should be available all day long whereas other items like halwa poori and murgh cholay should be made available in the breakfast. Menu for lunch and dinner can be decided depending upon how large the owner wants the business to be. Establishment of this business successfully imparts the need to advertise it in such a way that the benefits of these food items in general and what they offer in comparison to the typical Western food, in particular, are easily noticeable for the audiences. To achieve this, the contemporary issue of diseases caused by consumption of chemicals needs.

Target marget Essay Example | Topics and Well Written Essays - 250 words

Target marget - Essay Example p.). While innovators are proven â€Å"risk takers† who are the â€Å"first 2.5%† that will purchase a product, and early adopters are the ones who will purchase a product after some positive response from the overall market (about 13.5% of consumers), the early majority are the group of consumers who actually tends to avoid risk and purchase a product after majority of the market have already made a positive response about the product (34% of consumers) (â€Å"Product Diffusion Curve,† n. p.). Meanwhile, consumers in the late majority group are characterized by skeptic consumers who are only willing to purchase a product after the product is already commonly used (another 34%), and laggards are the ones that will last purchase a product (16% of consumers) (quickmba.com, n. p.). With this knowledge, I will choose to target the early majority; given that I am offering a new product, I would package the product to immediately generate positive response and interest . I am optimistic that getting the support of the early majority would lead the product to be accepted by majority of consumers. Works Cited â€Å"Product Diffusion Curve.† Quickmba.com. Quickmba, n. d. Web. 14 February 2011.