The Mesothelioma SOS Glossary - Diaphragm
The diaphragm is the muscle extending across the bottom of the ribcage. Shaped like a dome in its relaxed state, the diaphragm separates the thoracic cavity, or the lungs and heart, from the abdominal cavity, or the cavity containing the stomach, intestines and liver. The diaphragm is a crucial component of respiration. As the diaphragm contracts, air is drawn into the lungs by reducing pressure in the thoracic cavity. As the diaphragm relaxes, air is expelled from the lungs. Additionally, the diaphragm assists the body in expelling vomit, urine and feces from the body by contracting to increase abdominal pressure.
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