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group of organs stretching from the mouth to the anus, serving to breakdown foods, assimilate nutrients, and eliminate waste; in humans, the digestive system includes the gastrointestinal tract (mouth, esophagus, stomach, intestines, anus) and the accessory glands (liver, biliary tract, pancreas), and associated hormones and secretions.
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system consists of the gastrointestinal tract, a tube extending from the mouth to the anus; its purpose is to break down food, prepare it for absorption and eliminate waste.
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