Compared to the atmospheric air, the alveolar air has

p O_{2}

and less

p C O_{2}

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Less

p O_{2}

and more

p C O_{2}

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p O_{2}

and more

p C O_{2}

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Less

p O_{2}

and less

p C O_{2}

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Solution

The correct option is A Less $p O_{2}$ and more $p C O_{2}$
The partial pressure of oxygen (pO $_{2}$ ) in the atmospheric air is higher than the partial pressure of oxygen (pO $_{2}$ ) in alveolar air. In atmospheric air, pO $_{2}$ is about 159 mm of Hg. In alveolar air, it is about 104 mm of Hg. The partial pressure of carbon dioxide (pCO $_{2}$ ) in atmospheric air is lesser than the partial pressure of carbon dioxide (pCO $_{2}$ ) in alveolar air. In atmospheric air, pCO $_{2}$ is about 0.3 mm of Hg. In alveolar air, it is about 40 mm of Hg. The less pO $_{2}$ in the alveolar air helps in more absorption of O $_{2}$ . The high pCO $_{2}$ in the atmospheric air helps in release of CO $_{2}$ into the air.
Thus, the correct answer is option B.

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Similar questions

What will be the pO₂ and pCO₂ in the atmospheric air compared to those in the alveolar air?

(i) pO₂ lesser, pCO₂ higher

(ii) pO₂ higher, pCO₂ lesser

(iii) pO₂ higher, pCO₂ higher

(iv) pO₂ lesser, pCO₂ lesser

What will be the $p O_{2}$ and $p C O 2$ in the atmospheric air compared to those in the alveolar air?

p O_{2}

p C O_{2}

C O_{2}

$C O_{2}$ dissociates from carbamino haemoglobin when

(a) $p C O_{2}$ is high and $p O_{2}$ is low

(b) $p O_{2}$ is high and $p C O_{2}$ is low

(d) None of the above

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