The partial pressure of oxygen in the al...

The partial pressure of oxygen in the alveoli of the lungs is

equal to that in the blood

more than that in the blood

less than that in the blood

less than that of carbon dioxids

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The correct Answer is:

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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