During external respiration, the PO₂ is greater in the alveoli than in the blood of the pulmonary capillaries.

Name: During external respiration, the PO₂ is greater in the alveoli than in the blood of the pulmonary capillaries.
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Quizplus · Accepted Answer

This is true. During external respiration, the oxygen diffuses from the alveoli, where the PO₂ is high, to the blood in the pulmonary capillaries, where the PO₂ is lower. This drives the oxygen uptake by the blood.

During External Respiration, the PO₂ Is Greater in the Alveoli