Why the alveolar air in mammals (alveolar PO2 is 100mm Hg) is not of the same
composition as inspired atmospheric air, PO2 being 160 mm Hg?
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More specifically, alveolar PO2 is higher in the alveoli (PALVO2 = 100 mm Hg) than blood PO2 (40 mm Hg) in the capillaries. Because this pressure gradient exists, oxygen diffuses down its pressure gradient, moving out of the alveoli and entering the blood of the capillaries where O2 binds to hemoglobin.
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