Question

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

Answer 1

Answer: (B)

The partial pressure of oxygen in alveoli of lungs is 104 mm of Hg that is more than that of blood in the pulmonary artery (40 mm of Hg).