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alimentary canal the tube in the body through which food travels as it is digested. The alimentary canal goes from the mouth to the anus, and includes the esophagus, the stomach, and the small and large intestines.
digestive system the parts of the body that work together to break down food so that it can be used by the body as energy. The human digestive system includes the mouth, esophagus, stomach, and intestines.