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Identify 3 physical conditions that can optimize rate of diffusion of a gas across a membrane, and relate these to Fick’s Law of Diffusion.
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- What are 3 physical conditions that can optimize the rate of diffusion of a gas across a membrane (contained in Fick’s Law)?The direction that a gas diffuses is determined by a. the solubility of the gas in the solutions present on either side of a semipermeable membrane b. the partial pressure of the gas on either side of a semipermeable membrane c. the concentration of solutes in the solution into which the gas is dissolving d. none of the choices is correctThe small capillaries in the lungs are in close contact with the alveoli. A red blood cell takes up oxygen during the 0.5 s that it squeezes through a capillary at the surface of an alveolus. What is the diffusion time for oxygen across the 1-μm -thick membrane separating air from blood? Assume that the diffusion coefficient for oxygen in tissue is 2×10−11m2/s. Give your answer to 1 significant figure.
- What inluences the difusion of a gas across a membrane?The diffusion coefficient of a gas is a constant and is not affected by disease states or treatment options. In contrast the other factors that determine gas diffusion through the respiratory membrane is affected by changes.Name the factors that can cause an increase in the diffusion rate through the respiratory membrane and provide detailed examples of conditions that will cause this increase.Identify 3 physical conditions that can optimize rate of diffusion of a gas across a membrane, and relate these to Fick’s Law of Diffusion. Please describe 3 ways animal respiratory systems have evolved in order to maximize the exchange of O2and CO2across their membranes.
- A trout exposed to acid mine drainage experiences an increase in mucus production along the gills. According to Fick’s law of diffusion, how would that affect the movement of oxygen through the gill capillaries?The equation describing the linear relationship between hemoglobin concentration and absorbance at 520 nm is y=0.0523x+0.011. If the absorbance value is 0.6, calculate the % hemoglobin in whole blood.A membrane can separate gas mixture because different gases have different permeability through the membrane. The permeate flux across unit membrane area under unit pressure gradient is called permeability and the ratio between the permeability of gas A and that of gas B is defined as selectivity of A to B. Membrane separation process depends upon five separation mechanisms including molecular sieving, Knudsendiffٴusion, solution diffٴusion, surface diffusion, and capillary condensation. Using a schematic diagram, elaborate on the mechanism of surface diffusion and solution diffusion in membrane separation.