The partial pressure of oxygen in the alveoli of the lungs is (a) equal to that in the blood
The partial pressure of oxygen in the alveoli of the lungs is
(a) equal to that in the blood
(b) more than that in the blood
(c) less than that in the blood
(d) less than that of carbon dioxide
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Correct Option (b) more than that in the blood
Explanation:
The partial pressure of oxygen in alveoli of lungs is 104 mm Hg, which is more than that of blood in the blood capillaries of lung alveoli.
This difference allows passive diffusion of O2 from air filled in the lungs to the blood vessels of lung alveoli.
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