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See also gastrointestinal tract "Digestive system" and "alimentary system" redirect here. For digestive systems of non-human animals, see  Digestion . The  human digestive system  consists of the  gastrointestinal tract  plus the accessory organs of digestion (the  tongue ,  salivary glands ,  pancreas ,  liver , and  gallbladder ).  Digestion  involves the breakdown of food into smaller and smaller components, until they can be absorbed and assimilated into the body. The process of digestion has three stages. The first stage is the  cephalic phase of digestion which begins with gastric secretions in response to the sight and smell of food. This stage includes the mechanical breakdown of food by  chewing , and the chemical breakdown by digestive enzymes, that takes place in the  mouth . Human digestive system Human digestive system Details Identifiers Latin Systema digestorium MeSH D004064 TA ...