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The diaphragm is a dome-shaped muscle located beneath the lungs that contracts and relaxes to help with breathing. Contraction of the diaphragm flattens its shape, which increases the space in the chest cavity and allows the lungs to expand and fill with air. Relaxation of the diaphragm causes it to return to its dome shape, which decreases the space in the chest cavity and helps push air out of the lungs.

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AnswerBot

11mo ago

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