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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.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?
- 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 aboveWhat 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 %3DThe 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.
- At 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).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 po₂Use 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 nm
- What 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−Explain Fick’s first law of diffusion?I believe I use the diffusion law on this: (Diffusion Constant × ∆Concentration × Area) / Thickness. Then change the constant into micrometers (x10^-12). Maybe use the fact that oxygen = 16 grams/mol. Am I on the right track? Thank you for any help you can provide.