Question 5 / 12:  Of the following, which does not explain why the partial pressure of oxygen is lower in the lung than in the external air?
a.  Air in the lung is humidified; therefore, water vapor pressure alters the pressure.
b.  Carbon dioxide mixes with oxygen.
c.  Oxygen is moved into the blood and is headed to the tissues.
d.  Lungs exert a pressure on the air to reduce the oxygen pressure.
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Biology 39 The Respiratory System MCQ

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