Definition for Air sac
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Revision as of 19:26, 15 February 2011 by Bio man (Talk | contribs) (Created page with "A component of the avian respiratory system; air sacs—not lungs—expand when a bird inhales and shrink when it exhales, and they do not participate in gas exchange.")
A component of the avian respiratory system; air sacs—not lungs—expand when a bird inhales and shrink when it exhales, and they do not participate in gas exchange.