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The gastrointestinal, or GI, tract includes the oral cavity, pharynx, esophagus, stomach, and the small and large intestine. The GI tract is part of the digestive system, and it is responsible for moving food and liquid into and out of the body.

At the junction of the esophagus and the stomach lies a muscle called the lower esophageal sphincter, which opens to allow food to enter the stomach and then closes to keep food and stomach ... more