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Definition of gastrointestinal tract. medical. : the part of the digestive system that consists of the stomach and intestines.
The human gastrointestinal tract is the stomach and intestine, sometimes including all the structures from the mouth to the anus. (The  digestive system  is a broader term that includes other structures, including the accessory organs of digestion).In an adult male human, the gastrointestinal (GI) tract is 5 metres long in a live subject, or up to 9 metres without the effect of muscle tone, and consists of the upper and lower GI tracts.The  digestive system  is a broader term that includes other structures, including the accessory organs of digestion). In an adult male human, the gastrointestinal (GI) tract is 5 metres long in a live subject, or up to 9 metres without the effect of muscle tone, and consists of the upper and lower GI tracts.