Card 7 / 16: 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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