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|Noun||1.||gastrointestinal system - the system that makes food absorbable into the body|
body, organic structure, physical structure - the entire structure of an organism (an animal, plant, or human being); "he felt as if his whole body were on fire"
system - a group of physiologically or anatomically related organs or parts; "the body has a system of organs for digestion"
liver - large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes
pancreas - a large elongated exocrine gland located behind the stomach; secretes pancreatic juice and insulin
alimentary canal, alimentary tract, digestive tract, digestive tube, gastrointestinal tract, GI tract - tubular passage of mucous membrane and muscle extending about 8.3 meters from mouth to anus; functions in digestion and elimination
digestive gland - any gland having ducts that pour secretions into the digestive tract
salivary gland - any of three pairs of glands in the mouth and digestive system that secrete saliva for digestion