GAS EXCHANGE ACROSS PULMONARY CAPILLARIES

• Both oxygen and carbon dioxide diffuse down their concentration (partial pressure) gradients

Inspired Air PO2 = 160mmHg

PCO2 = 0.03mmHg

LUNG

PO2 = 100mmHg

PCO2 = 40mmHg

PO2 = 40mmHg

PCO2 = 46mmHg

PULMONARY CAPILLARIES

PO2 = 100mmHg

PCO2 = 40mmHg

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