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The oxygen partial pressure in the lungs' alveoli is

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Less than that in the blood

More than that in the blood

Less than that of carbon dioxide

Equal to that in the blood

answer is B.

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Detailed Solution

Concept: The oxygen partial pressure in the lungs' alveoli is greater than that in the blood.

While the partial pressure of oxygen in blood that has been oxygenated is 95 mm Hg, the partial pressure of oxygen in the lung's alveoli is 104 mm Hg.

As a result, oxygen diffuses from the alveoli into the bloodstream across the respiratory membrane.

Hence option 2 is correct answer

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