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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
The gastrointestinal tract is a continuous muscular tube through which digesting food is transported on its way to the colon. The coordinated activity of the muscles of the stomach and small intestine propels the food from the stomach, through the small intestine, and into the colon.Even when there is no food in the small intestine, muscular activity sweeps through the small intestine from the stomach to the colon. In both cases, abnormal muscular activity in the small intestine allows SIBO to develop. 2  Partial or intermittent obstruction of the small intestine interferes with the transport of food and bacteria through the small intestine and can result in SIBO.