If the total pressure of a gas is 700 mm Hg and its composition is 20% oxygen, 0.03% carbon dioxide, 75% nitrogen, and 5% water vapor, the partial pressure of oxygen (PO2) is
A) 15 mm Hg.
B) 20 mm Hg.
C) 105 mm Hg.
D) 140 mm Hg.
E) 1600 mm Hg.
Answer: D) 140 mm Hg.
Anatomy & Physiology
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