When you inhale, the diaphragm and muscles between your ribs contract, creating a negative pressure - or vacuum inside your chest cavity. The negative pressure draws the air that you breathe into your lungs.
By Lori Alma, About.com
Updated: September 22, 2008
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
When you inhale, the diaphragm and muscles between your ribs contract, creating a negative pressure - or vacuum inside your chest cavity. The negative pressure draws the air that you breathe into your lungs.
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