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) > oxygenated blood (95) > Tissues (40) = deoxygenated blood (40).
Pulmonary vein carries oxygenated blood while pulmonary artery carries deoxygenated blood.

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