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Definition. The esophagus is the swallowing tube through which food passes on its way from the mouth to the stomach. The main function of this organ is to propel food down into the stomach. There is also a mechanism to prevent food from coming back up or refluxing from the stomach into the esophagus.Esophageal function tests are used to determine if these processes are normal or abnormal.he main function of this organ is to propel food down into the stomach. There is also a mechanism to prevent food from coming back up or refluxing from the stomach into the esophagus. Esophageal function tests are used to determine if these processes are normal or abnormal.
8,020 Answers. 353,393 Helpful Votes. 388 Followers. A. The lower esophageal sphincter (LES) is the natural valve that keeps stomach contents in the stomach and out of the esophagus. When working properly, this important muscle operates like a door, letting food into the stomach but not back up into the esophagus.It is also known as LES.,020 Answers. 353,393 Helpful Votes. 388 Followers. A. The lower esophageal sphincter (LES) is the natural valve that keeps stomach contents in the stomach and out of the esophagus. When working properly, this important muscle operates like a door, letting food into the stomach but not back up into the esophagus.