The partial pressure of oxygen in the alveoli of the lungs is:
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The partial pressure of oxygen in the alveoli of the lungs is:
✓ Correct answer: b) more than that in the blood
ExplanationThe partial pressure of oxygen (pO₂) in the alveoli of the lungs is higher than in the deoxygenated blood arriving via pulmonary arteries.In alveoli, pO₂ is around 104 mmHg, while in deoxygenated blood it is about 40 mmHg.This difference allows oxygen to diffuse from alveoli into the blood.Carbon dioxide moves in the opposite direction due to its higher partial pressure in blood.This gas exchange maintains proper oxygenation of blood for delivery to body tissues.
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