Sunday, April 22, 2012

Gas Exchange

When we breathe the air around us the respiratory and pulmonary circulation systems exchange oxygen in the air for carbon dioxide in the blood. The exchange of carbon dioxide for oxygen and vice versa is called gas exchange, which you learned in Lesson 4. Gas exchange occurs at the level of the alveoli those buds that cluster around the last bit of the bronchial tree, across the respiratory membrane.

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