Question

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

• A. Less than that of carbon dioxide
• B. Equal to that in the blood
• C. More than that in the blood
• D. Less than that in the blood

Answer 1

The correct option is C More than that in the blood

Following is the table given in which partial pressures are depicted at different levels-

Respiratory Gas	Atmospheric Air	Alveoli	Blood (Deoxygenated)	Blood (Oxygenated)	Tissues
$O_2$	159	104	40	95	40
$C{O}_2$	0.3	40	45	40	45

So, the partial pressure of oxygen in the alveoli of the lungs is more than that in the blood.