Why is the PO2 of the blood leaving pulmonary capillaries 104 mm Hg, but the blood leaving the lungs to enter the left atrium is 95 mm Hg?
A. Some O2 diffuses out of the blood as it travels through the pulmonary veins.
B. Some CO2 in the alveoli is mixed with oxygenated blood from alveolar circulation.
C. Some O2 is incorporated into bicarbonate ion, removing it from solution and reducing PO2.
D. Deoxygenated blood from bronchial circulation is mixed with blood from oxygenated alveolar circulation.
Answer: D
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