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Q.

Partial pressure of oxygen in alveolar air is 

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a

40 mm Hg

b

95 mm Hg

c

104 mm Hg

d

159 mm Hg

answer is B.

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Detailed Solution

pO2 in alveolar air is 104 mm Hg.

pO2 in the atmosphere is 159 mm Hg.

pO2 in oxygenated blood  is 95 mm Hg.

pO2 in deoxygenated blood and at tissues  is 40 mm Hg.

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Partial pressure of oxygen in alveolar air is