This animation shows normal breathing. As you breathe in, red air that contains lots of oxygen is pulled into the lungs. The oxygen slowly moves out of the lungs and into the blood, and then blue air that contains carbon dioxide is pushed out of the lungs. When things are working normally, the amount of air we breathe in is about the same as the amount of air we breathe out.
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All contents copyright (C) 1996, Stephen M. Borowitz. All rights reserved
Revised: September 15, 1996