NEET Biology question

The respiratory membranes facilitate 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 100 mm Hg respectively
(B)Partial pressure of oxygen in alveolar air and capillaries is 100 mm Hg and 40 mm Hg respectivelyCorrect
(C)Partial pressure of oxygen in alveolar air and capillaries is 46 mm Hg and 40 mm Hg respectively
(D)Partial pressure of oxygen in alveolar air and capillaries is 40 mm Hg and 46 mm Hg respectively

Answer: (B)

Solution

Oxygen diffuses from alveolar air (pO ≈ 100-104 mm Hg) into the deoxygenated blood in the pulmonary capillaries (pO ≈ 40 mm Hg) because

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Question ID VK-119218