GAS EXCHANGE ACROSS SYSTEMIC CAPILLARIES

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

TISSUE

PO2 < 40mmHg

PCO2 > 46mmHg

PO2 = 40mmHg

PCO2 = 46mmHg

SYSTEMIC CAPILLARIES

PO2 = 100mmHg

PCO2 = 40mmHg

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