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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
Lower Gastrointestinal Tract (Lower GI Tract). The lower part of the gastrointestinal tract that includes the jejunum and ileum of the small intestine and the large intestine. Peristalsis. A wavelike movement of muscles in the gastrointestinal (GI) tract. Peristalsis moves food and liquid through the GI tract.he lower part of the gastrointestinal tract that includes the jejunum and ileum of the small intestine and the large intestine. Peristalsis. A wavelike movement of muscles in the gastrointestinal (GI) tract.