Trace the correct path of an oxygen molecule moving from your alveoli into the blood.

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Lumen of alveolus → epithelium of alveolus → basement substance → endothelium of capillary → blood

Lumen of alveolus → epithelium of alveolus → endothelium of capillary → basement substance → blood

Lumen of alveolus → basement substance → epithelium of alveolus → endothelium of capillary → blood

Lumen of alveolus → endothelium of capillary → basement substance → epithelium of alveolus → blood

answer is A.

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Detailed Solution

The diffusion membrane is made up of three major layers namely, the thin squamous epithelium of alveoli, the endothelium of alveolar capillaries and the basement substance in between them. The oxygen molecule must first move through the alveolar epithelium, then the basement substance and then the endothelium.

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