What willbe the pO₂ and pCO₂ in the atmospheric aircompared to those in the alveolar air?
(i) pO₂lesser, pCO₂ higher
(ii) pO₂higher, pCO₂ lesser
(iii) pO₂higher, pCO₂ higher
(iv) pO₂ lesser, pCO₂lesser

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Solution

Answer:(ii) pO₂ higher, pCO₂ lesser
Thepartial pressure of oxygen in atmospheric air is higher than that ofoxygen in alveolar air. In atmospheric air, pO₂ is about159 mm Hg. In alveolar air, it is about 104 mm Hg.
Thepartial pressure of carbon dioxide in atmospheric air is lesser thanthat of carbon dioxide in alveolar air. In atmospheric air, pCO₂is about 0.3 mmHg. In alveolar air, it is about 40 mm Hg.

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