How Does the Diaphragm Work? The diaphragm also known as the thoracic diaphragm as a nod to the fact that humans also have another muscle with a similar name is a layer of muscle positioned within and across the bottom of the rib cage. Shaped similarly to an open parachute it separates the thoracic cavity of the rib cage in which the heart and lungs are situated from the cavity in the abdomen that houses the stomach liver and other organs. It also functions to control breathing as its contra...
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