Digestive System

"Gut" redirects here. For the physiological acronym 'GUT', see genitourinary tract. For the Physics term 'GUT', please refer to Grand unification theory. The gastrointestinal tract or digestive tract, also referred to as the GI tract or the alimentary canal or the gut, is the system of organs within multicellular animals which takes in food, digests it to extract energy and nutrients, and expels the remaining waste. The GI tract differs substantially from animal to animal. For instance, ...