Given below are two statements.
Statement I: The partial pressure gradient for O₂favours the diffusion of O₂from alveoli to blood and blood to tissues.
Statement II: The partial pressure gradient for CO₂favours the diffusion of CO₂from tissues to blood and blood to alveoli.
In light of the above statements, choose the correct answer from the options given below.

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Statement I is incorrect but statement II is correct.

Both statement I and statement II are correct.

Statement I is correct but statement II is incorrect.

Both statement I and statement II are incorrect.

answer is A.

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Detailed Solution

The partial pressure gradient for O₂favours the diffusion of O₂from alveoli (104 mm Hg) to deoxygenated blood in the pulmonary capillaries (40 mm Hg) and from oxygenated blood in systemic capillaries (95 mm Hg) to tissues (40 mm Hg).

The partial pressure gradient for CO₂favours the diffusion of CO₂from systemic tissues (45 mm Hg) to oxygenated blood in systemic capillaries (40 mm Hg) and from deoxygenated blood in pulmonary capillaries (45 mm Hg) to alveoli (40 mm Hg).

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