Topic: Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders· Human Physiology

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

1. more than that in the blood

2. less than that in the blood

3. less than that of carbon dioxide

4. equal to that in the blood

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 1. more than that in the blood

Gases move from higher to lower partial pressure (pO₂).

Alveolar pO₂ is about 104 mm Hg, while deoxygenated blood in the pulmonary capillaries has about 40 mm Hg. So oxygen diffuses from alveoli into blood, meaning alveolar pO₂ is more than that in the blood.

Alveolar pCO₂ is only about 40 mm Hg, much less than pO₂, so options 3 and 4 are also wrong.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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

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