Which of the following statements about alveolar gas exchange is incorrect?

Practice question

Question

Which of the following statements about alveolar gas exchange is incorrect?

Options

Choose one · Correct answer highlighted

Oxygen diffuses from alveoli into pulmonary capillaries due to partial pressure differences. Carbon dioxide diffuses from blood into alveolar air due to its high solubility. The alveolar walls are composed of a thick layer of smooth muscle to regulate diffusion. Correct Gas exchange occurs across a thin respiratory membrane.

Explanation

The alveolar walls are composed of a thin squamous epithelial layer to facilitate gas diffusion, not smooth muscle.

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