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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
Digestion and Absorption of Food. The gastrointestinal (GI) system includes the gastrointestinal tract (mouth, pharynx, esophagus, stomach, small intestine, large intestine) and accessory organs (salivary gland, liver, gallbladder, pancreas) that secrete substances into the tract via connecting ducts.