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Concept Version 7
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Characteristics of Birds

Avian respiration

Avian respiration

Avian respiration is an efficient system of gas exchange with air flowing unidirectionally. During inhalation, air passes from the trachea into posterior air sacs, then through the lungs to anterior air sacs. The air sacs are connected to the hollow interior of bones. During exhalation, air from air sacs passes into the lungs and out the trachea.

Source

    Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:

    "OpenStax College, Birds. October 17, 2013."
    http://cnx.org/content/m44694/latest/Figure_29_05_03f.jpg OpenStax CNX CC BY 3.0.

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