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Oxygen Dissociation Curve

Choose the co...

Question

Choose the correct answer from the alternatives given.
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}

lesser,

p C O_{2}

higher

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p O_{2}

higher,

p C O_{2}

lesser

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p O_{2}

higher

p C O_{2}

higher

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p O_{2}

lesser,

p C O_{2}

lesser

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Solution

The correct option is B $p O_{2}$ higher, $p C O_{2}$ lesser
The partial pressure of oxygen (pO $_{2}$ ) of atmospheric air is about 160 mm Hg and that of alveolar air is about 104 mm Hg. The partial pressure of carbon dioxide (pCO $_{2}$ ) on the other hand of atmospheric air is 0.3 mm Hg and that of alveolar air is 40 mm Hg. Therefore, the partial pressure of atmospheric oxygen is higher and that of atmospheric oxygen is lesser as compared to those in alveolar air. So, the correct option is 'pO $_{2}$ higher, pCO $_{2}$ lesser'.

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