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The partial pressure of oxygen in the al...

The partial pressure of oxygen in the aleoli 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 dioxids

Text Solution

Verified by Experts

The correct Answer is:
B
The partial pressure of oxygen `(pO_(2))` in alveoli of lungs is 104 mm Hg, which is more than that of blood in the blood capillaries of lung alveoli (40 mm Hg)
This difference allows pasive diffusion of `O_(2)` from air filled in the lungs to the blood vessels of lung alveloi.
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