The partial pressure of oxygen ($pO_2$) in the alveolar air and deoxygenated blood is respectively:
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Correct answer: 104 mm Hg and 40 mm Hg
In the alveoli, the $pO_2$ is 104 mm Hg, which is higher than the $pO_2$ in deoxygenated blood (40 mm Hg). This gradient allows oxygen to diffuse from the alveoli into the blood.
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