Diffusion of gases such as 02 and C02

- The diffusion rates of 02 and C02 depend on the partial pressure differences across the membrane and the area available for diffusion.

-For example, the diffusion of 02 from alveolar air into the pulmonary capillary depends on the partial pressure difference for 02 between alveolar air and pulmonary capillary blood. Normally, capillary blood equilibrates with alveolar gas; when the partial pressures of 02 become equal (see Table 4-2), then there is no more net diffusion of 02.

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Anxiety and Depression 101

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