Question

The partial pressure of oxygen in the alveolar air is
45 mm.Hg
95 mm.Hg
104 mm.Hg
40 mm.Hg​

Answer 1

Explanation:

Partial pressures

The alveolar oxygen partial pressure is lower than the atmospheric O2 partial pressure for two reasons. Firstly, as the air enters the lungs, it is humidified by the upper airway and thus the partial pressure of water vapour (47 mmHg) reduces the oxygen partial pressure to about 150 mmHg.

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Answer 2

The partial pressure of O2 in the alveoli is 104 mm Hg.

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