________ are tiny air sacs through which oxygen and carbon dioxide pass in and out of the bloodstream.
The alveoli are tiny air sacs through which oxygen and carbon dioxide pass in and out of the bloodstream.
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Asked 2/14/2012 4:08:25 PM
Updated 1/15/2019 6:52:05 PM
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Masamune [1/15/2019 6:52:03 PM]
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