First slide

Exchange of Gases

Question

The partial pressure of oxygen in the pulmonary vein is

Moderate

A

Greater than that in the alveoli
B

Equal to that in the alveoli
C

Greater than that in the pulmonary artery
D

Lesser than that in the systemic veins

Solution

Partial pressure of oxygen (in mm Hg):
Alveoli (104) > pulmonary vein (95) > Tissues (40) = systemic veins / pulmonary artery (40)

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