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diaphragm
Top: during inhalation the diaphragm contracts downward, forcing air into the lungs
Bottom: during exhalation the diaphragm relaxes upward, forcing air out of the lungs
The American Heritage® Medical Dictionary Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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