The partial pressure of oxygen in the alveoli of the lungs is

Equal to that in the blood.

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More than that in the blood.

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Less than that in the blood.

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Less than that of carbon dioxide.

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Solution

The correct option is D More than that in the blood.
The partial pressure of oxygen in the alveoli of the lungs is more than that in the blood. Partial pressure of oxygen in the alveoli of the lung is 104 mm Hg whereas the partial pressure of oxygen in oxygenated blood is 95 mm Hg. Due to this, oxygen diffuses across the respiratory membrane from the alveoli into the blood.
Thus, the correct answer is option B.

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