The gastrointestinal tract within the abdomen allows for the receiving of food and water from the mouth and subsequent transport, digestion absorption and excretion along the tract which is about 20 feet long.
The stomach advances the food to the duodenum subsequently to the jejunum, ileum, ascending transverse, descending colon, and finally to the rectosigmoid for excretion.
The many parts of the tract collaborate and connect with other parts of the body with connections via the vascular, lymphatic and nervous system.