For normal gas exchange in the lung, which of the following is true?

A. Oxygen diffuses into the alveoli because the PO2 is higher in the blood than in the alveoli

B. Oxygen diffuses out of the alveoli because the PO2 is higher in the alveoli than in the blood

C. Oxygen diffuses into the alveoli because the PO2 is higher in the alveoli than in the blood

D. Oxygen diffuses out of the alveoli because the PO2 is higher in the blood than in the alveoli

Reveal the answer

B. Oxygen diffuses out of the alveoli because the PO2 is higher in the alveoli than in the blood

Content adapted from ClinicalKey Student question bank

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