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6 / 29  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, Biology. OpenStax CNX. Feb 29, 2016 Download for free at http://cnx.org/content/col11448/1.10
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