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6 / 14  The partial pressure of carbon dioxide is 45 mm Hg in the blood and 40 mm Hg in the alveoli. What happens to the carbon dioxide?
A  It diffuses into the blood.
B  It diffuses into the alveoli.
C  The gradient is too small for carbon dioxide to diffuse.
D  It decomposes into carbon and oxygen.

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Source:  OpenStax, Human biology. OpenStax CNX. Dec 01, 2015 Download for free at http://legacy.cnx.org/content/col11903/1.3
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