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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)?
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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.The 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.Ventilators are often used for individuals with COVID-19 to increase the rate of diffusion of gases across the alveoli. Ventilators could increase the rate of diffusion by impacting which factor of Fick’s law of membrane diffusion: a decreasing the diffusion coefficient (D) b decreasing surface area (A) c increasing the partial pressure difference (P1-P2) d increasing the diffusion distance e all of the above
- You have 3 cubes, A, B, and C. They have surface to volume ratios of 3:1, 5:2, and 4:1 respectively. Which of these cubes is going to be the most effective at maximizing diffusion, how do you know that?What is the typical value of Diffusion Distance in the air and tissue for an Oxygen molecules after 1 sec if N = 1012 in air and N = 1014in tissue? %3D %3DAt a region in space immediately surrounding a point (xo,Yo,Zo) near the shoreline of a lake, the concentration of dust particles at time t, is C(x, Yo, Z,, to). The time-averaged air flow velocity is ū = v(y,z)j + w(y,z)k. Molecular diffusion of tiny dust particles is non-negligible in all directions (diffusion coefficient D), is constant and uniform. Write an expression for the rate change of the concentration of dust particles aC/at at point (x,,Yo, Zo).
- The diffusion coefficient for potassium ions crossing a biological membrane 10 nm thick is 1.0 x 10-11 m2/s. What flow rate of potassium ions will move across an area of 100 nm x 100 nm if the concentration difference across the membrane is 0.5 mol/dm3.Which of the above curves corresponds to myoglobin in a solution containing physiological concentrations of CO2 and BPG at a pH of 6.8? O O O O O Saturation (Y) Curve 1 Curve 2 Curve 3 2 3 Curve 4 None of the above po₂What happens to pCO2 levels as the disease (Idiopathic pulmonary fibrosis) progresses, and what would the teeter totter look like in this situation?CO2+ H2O ⇌ H2CO3 ⇌ H++ HCO3−
- Use the Stokes-Einstein equation to estimate the diffusion coefficient in m2/s and in um?/s for the following particles. Assume that the particles are immersed in water in a test tube at body temperature (37 °C), which has a viscosity of approximately 0.0007 kg m1 s1. Assume the particles are all spherical Particle Diameter ATP 1.4 nm Eukaryotic ribosome 25 nm SARS-COV-2 100 nmExplain Fick’s first law of diffusion?In two different respiratory systems, respiratory membranes 1 and 2 represent membrane barriers between the outside medium and the inside of the organism. Which of the following is a true statement about these two membranes? Respiratory membrane 1 Respiratory membrane 2 O Respiratory membrane 1 and respiratory membrane 2 would have equal rates of diffusion. O Repiratory membrane 1 would have a higher rate of diffusion because it has a higher surface area for exchange. O Repiratory membrane 1 would have a higher rate of diffusion because it has a greater difference in partial pressures of gas between the outside and inside of the organism. Repiratory membrane 2 would have a higher rate of diffusion because it has a greater difference in partial pressures of gas between the outside and inside of the organism. O Repiratory membrane 2 would have a higher rate of diffusion because it has a higher surface area for exchange. MacBook Pro esc
