What occurs in the bases of the lung when a person is standing upright?
a. The PAO2 is higher than normal.
b. The respiratory exchange ratio is elevated.
c. There is significant dead space under normal conditions.
d. The is lower than the average.
ANS: D
At the bottom of the lung, blood flow is greater than ventilation, resulting in a low / (approxi-mately 0.66), low PO2 (89 mm Hg), and slightly higher PCO2 (42 mm Hg).
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