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Biology Breathing and Exchange of Gases General Single Correct MCQ
Published on: August 13, 2026

The respiratory membranes facilitates the exchange of respiratory gases through diffusion. Oxygen enters the deoxygenated blood through diffusion because :-

A
Partial pressure of oxygen in alveolar air and capillaries is 40 mm Hg and 100mm Hg respectively
B
Partial pressure of oxygen in alveolar air and capillaries is 100 mm Hg and 40 mm Hg respectively
C
Partial pressure of oxygen in alveolar air and capillaries is 46 mm Hg and 40mmHg respectively
D
Partial pressure of oxygen in alveolar air and capillaries it 40 mm Hg and 46 mmHg respectively

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