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General Medicine General 9d92e126

In a healthy subject, when is the PO2 of the blood leaving a pulmonary capillary lower than the PO2 in the alveolus served by that capillary?

A

While breathing a low O2 gas mixture

B

While performing an exercise in which the cardiac output doubles

C

At the base of the lungs, where perfusion exceeds ventilation

D

None of the above

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