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Physiology of Breathing

By Lori Alma, About.com

Updated: September 22, 2008

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

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Gas Exhange

Photo © Lori Alma

When the air reaches the alveoli, oxygen diffuses through the membrane into small blood vessels called capillaries, and carbon dioxide diffuses from the blood in the capillaries into the alveoli.

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