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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.
From mouth to stomach, the food conduit consists of the oral cavity, pharynx, and esophagus. The esophagus serves as a dynamic tube, pushing food toward the stomach, where digestion and absorption can take place. Mucus produced by the esophageal mucosa provides lubrication and eases the passage of food. Active peristaltic contractions propel residual material from the esophagus into the stomach.