NEETBiologyBreathing and Exchange of GasesMCQ+4 / −1
The partial pressure of oxygen in the alveoli of the lungs is
- Aequal to that in the blood
- Bmore than that in the blood
- Cless than that in the blood
- Dless than that of carbon dioxide.
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Correct answer: B
The partial pressure of oxygen in alveolar air is 104mmHg whereas it is 40mmHg in deoxygenated blood and 95mmHg in oxygenated blood.
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