Gastroesophageal reflux - series
The esophagus is a narrow, muscular tube that carries food from the mouth to the stomach. A muscular ring (sphincter) at the junction of the esophagus and the stomach prevents reflux (backflow) of food and acid from the stomach into the esophagus.
Harvey Simon, MD, Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Senior Physician, Massachusetts General Hospital.
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