Q5  What will be the p O_2 and p CO_2 in the atmospheric air compared to those in the alveolar air?

       (i) p O_2 lesser, p CO_2 higher
      (ii) p O_2 higher, p CO_2 lesser
      (iii) p O_2 higher, p CO_2 higher
      (iv) p O_2 lesser, p CO_2 lesser

Answers (1)

PO2 higher, pCO2 lesser

As the partial pressure of oxygen in atmospheric air is higher than that of oxygen in alveolar air. So, in atmospheric air, pO2 is about 159 mm Hg and in alveolar air, it is about 104 mm Hg. The partial pressure of carbon dioxide in atmospheric air is lesser than that of carbon dioxide in alveolar air.

In atmospheric air, pCO2 is about 0.3 mmHg and in alveolar air, it is about 40 mm Hg. 

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