The diaphragm is a thin dome-shaped muscle which separates the thoracic cavity (lungs and heart) from the abdominal cavity (intestines, stomach, liver, etc. It is involved in respiration, drawing downward in the chest on inhalation, and pushing upward in exhalation. Update Date: 07/26/2007Daniel Rauch, M.D., FAAP., Director, Pediatric Hospitalist Program, New York University School of Medicine, New York, NY. Review provided by VeriMed Healthcare Network.
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