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What Is the Diaphragm?

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Updated October 10, 2012

What Is the Diaphragm? A.D.A.M. Medical Encyclopedia
Definition:

The diaphragm is the thin muscle that separates the chest from the abdomen.

The diaphragm is the main muscle the body uses for breathing. When it moves downward, it allows the lungs to expand and draw air into the body. When it moves up, it assists in forcing air out of the lungs.

Examples:
Jim was told that the surgical procedure for his mesothelioma would involve removing part of his diaphragm.

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