Biology - Breathing and Exchange of Gases Question with Solution | TestHub

The partial pressure of oxygen ($p{O}_2$) in the alveolar air is $104$ mmHg.

The blood entering the pulmonary capillaries is deoxygenated blood, which has a $p{O}_2$ of $40$ mmHg.

Due to this partial pressure gradient, oxygen diffuses from the alveoli into the blood in the pulmonary capillaries.

Thus, (i) is $40$ and (ii) is $104$.

Answer: i - 40 ; ii- 104