existence ends during fully formed stage anatomical system digestive system AAO:0000129 An anatomical system consisting of the alimentary canal and digestive glands responsible for intake, absorption, digestion and excretion of food.[AAO] Anatomical system that has as its parts the organs devoted to the ingestion, digestion, and assimilation of food and the discharge of residual wastes. BILA:0000082 BTO:0000058 CALOHA:TS-1293 EFO:0000793 EV:0100056 FBbt:00005055 FMA:7152 GAID:278 MA:0002431 MAT:0000018 MESH:D004064 MIAA:0000018 TADS:0000170 TAO:0000339 UBERON:0001007 WBbt:0005748 XAO:0000125 ZFA:0000339 alimentary system alimentary tract digestive galen:DigestiveSystem gastrointestinal system gut many anatomy ontologies consider gastrointestinal system synonymous with digestive system. here we follow MA in dividing digestive system into gastrointestinal and hepatobiliary. hepatobiliary includes the liver and biliary tract. species-specific AO classes are categorized according to whether liver is included. For example, XAO includes liver as part of XAO:0000125 alimentary system, so we assume this class is the more generic class ncithesaurus:Digestive_System uberon