At a partial pressure of 100 mm Hg in the alveoli, the percent saturation of hemoglobin with oxygen in the pulmonary capillaries will be __________.
A. almost 100 percent
B. about 90 percent, depending on the rate of blood flow
C. 80 percent or more, depending on how hard we breathe
D. 75 percent, because the solubility of oxygen in water is low
Answer: A
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