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The diaphragm separates the thoracic cavity containing the heart and lungs, from the abdominal cavity and performs an important function in respiration: as the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs.
After the heart, the diaphragm is perhaps the most important muscle in the body. The chief muscle of breathing, the diaphragm is a dome-shaped sheet of muscular tissue extending across the body below the chest cavity and separating the lungs and heart from the abdomen. The edge of the diaphragm follows the general outline of the lower ribs and attaches to the breastbone, or sternum, in front.