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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 esophagus is about 9-10 inches (25 centimeters) long and less than an inch (2 centimeters) in diameter when relaxed. It is located just posterior to the trachea in the neck and thoracic regions of the body and passes through the esophageal hiatus of the diaphragm on its way to the stomach....t the inferior end of the esophagus, the lower esophageal sphincter opens for the purpose of permitting food to pass from the esophagus into the stomach. Stomach acid and chyme (partially digested food) is normally prevented from entering the esophagus, thanks to the lower esophageal sphincter.