BIO 3302 Lecture Notes - Lecture 6: Fick'S Laws Of Diffusion, Respiratory Epithelium, Partial Pressure
16 Oct 2017
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Most have circulatory system to bring oxygen to tissue. Acidification in tissue needs to be dealt with. Especially with increase in size, complexity and rate of cellular metabolism. Important for the oxygen to be exchanged to the next step. Supplies gas exchange surface with respiratory medium (air, water) Diffusion of o2 and co2 across the respiratory epithelium a. Thin layer of cells (0. 5-15um) with large surface area. Bulk transport of o2 and co2 by blood between gas exchange surface and tissues. Diffusion of o2 and co2 between blood and cells. A lot of diffusion, thin diffusion barriers are important. Movement of molecules from high abundance to low abundance. From one region to another due to brownian motion. Depends on mobility of gas through diffusion barrier (kgas) permeability coefficient. Mobility of gases in air higher than in water generally (for oxygen air about 2000x) That"s why sea turtles go on to land to lay eggs.
