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