BIO 3302 Lecture Notes - Lecture 5: Respiratory Epithelium, Partial Pressure, Blood Gas Test
13 Dec 2016
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Topics to be covered: basic principles: Diffusion vs convection: blood gas transport, gas exchange organs, the control of ventilation. Diving (cid:1372) integrating gas exchange and circulation. For aerobic metabolism, require o2 supply and co2 removal: o2 supply critical, co2 removal needed to avoid acid-base disturbance, diffusion adequate for animals <1mm diameter, high sa:v, low mr. Diffusion gradients drive gases; o2 moves from cell into gradient, partial pressure difference drive o2 from envt into animal: gas exchange organ plus circulatory system. Pathway o2 is going to take (cid:1372) fallen partial pressure from envt to the mitochondria. Thin layer of cells (0. 5 - 15 m) Has a large sa and is thin to maximize diffusion: bulk transport of o2 and co2 by blood between gas exchange surface and tissues. Bulk transport = convective steps: diffusion of o2 and co2 between blood and cells.
