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5 / 24  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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Source:  OpenStax, Bmcc 103 - concepts of biology. OpenStax CNX. Aug 06, 2015 Download for free at https://legacy.cnx.org/content/col11855/1.2
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