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diaphragm definition | Concept | Medical Knowledge Base

Knowledge Base/Concept/diaphragm definition

diaphragm definition

The diaphragm is a large sheet of muscle that separates the chest cavity (containing the lungs and heart) from the abdominal cavity (containing the digestive organs). The diaphragm also serves as a muscle to help draw air into the lungs as a person breathes. It contracts to expand the lungs when breathing in (inhaling)...

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Last updated: Jan 7, 2026

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