Gas Exchange and Circulation

Gas exchange between the environment and cells is

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Unformatted text preview: n and carbon dioxide diffusion by presenting a large, thin surface area to the environment, and maintaining a steep partial- pressure gradient that favors entry of oxygen and elimination of carbon dioxide. Gas exchange between the environment and cells is based on diffusion. Normal conditions: Oxygen concentrations are relatively high in the environment and low in tissues Carbon dioxide levels are relatively high in tissues and low in the environment Therefore, oxygen tends to move from the environment into the tissues, and carbon dioxide from the tissues into the environment. Oxygen and carbon dioxide diffuse between the environment and cells along...
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This note was uploaded on 02/13/2014 for the course BIO 103 taught by Professor Heidielmendorf during the Fall '10 term at Georgetown.

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