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Solution


Q.

The partial pressure of oxygen in the alveoli of the lungs is           [2016]
1 equal to that in the blood  
2 more than that in the blood  
3 less than that in the blood  
4 less than that of carbon dioxide  

Ans.

(2)

The partial pressure of oxygen in alveolar air is 104 mmHg whereas it is 40 mmHg in deoxygenated blood and 95 mmHg in oxygenated blood.