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Physiology of Breathing

By Lori Alma, About.com

Updated: September 22, 2008

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How Your Lungs Work

Photo © A.D.A.M

The first stage of breathing, inhaling air into your lungs, is called inspiration or inhalation. Inspiration happens because of a large breathing muscle called the diaphragm, which is located underneath the lungs in the ribcage.

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