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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.
The food then enters the esophagus. The esophagus is a muscular tube extending from the pharynx and behind the trachea to the stomach. Food is pushed through the esophagus and into the stomach by means of a series of contractions called peristalsis.Just before the opening to the stomach is an important ring-shaped muscle called the lower esophageal sphincter (LES). This sphincter opens to let food pass into the stomach and closes to keep it there.he food then enters the esophagus. The esophagus is a muscular tube extending from the pharynx and behind the trachea to the stomach. Food is pushed through the esophagus and into the stomach by means of a series of contractions called peristalsis.