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cavity air lungs person

Diaphragm, in anatomy, dome-shaped, muscular partition separating the chest cavity from the abdominal cavity in humans and mammals. It plays an important role in respiration. By contracting when a person inhales, the diaphragm helps to pull air into the lungs. When a person exhales, the muscle relaxes, forcing air out of the lungs.

See also: Respiration.

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