part_of part of part of Homo sapiens anatomical system multicellular organism renal system EHDAA:5901 MA:0000325 FMA:7159 An anatomical system which consists of organs and tissues which produce, store, and excrete urine.[AAO] XAO:0000143 MESH:D014551 CALOHA:TS-1323 MIAA:0000027 ZFA:0000163 renal or urinary system BTO:0003092 The renal system in an anatomical system that maintains fluid balance and contributes to electrolyte balance, acid/base balance, and disposal of nitrogenous waste products. GAID:391 SCTID:362204003 urinary tract NCIT:C12413 urinary system systema urinarium UBERON:0001008 This definition is inclusive of the organs of the vertebrate renal system, as well as the Malpighian tubules of insects, and allows for future incorporation of structures such as the antennal glands of crustaceans MAT:0000027 EHDAA2:0001601 TAO:0000163 BTO:0001244 EV:0100095 BILA:0000015 EDITOR_NOTE In various sources such as Encyclopedia Britannica, the excretory and urinary systems are indeed the same system (see wikipedia talk page); we merge two BTO classes here WBbt:0005736 TADS:0000162 VHOG:0000723 AAO:0010257 EFO:0000803 In humans, the renal system comprises a pair of kidneys, a pair of ureters, urinary bladder, urethra, sphincter muscle and associated blood vessels systema urinaria Wikipedia:Excretory_system excretory system renal/urinary system EMAPA:17366 galen:UrinaryTract UMLS:C1508753 FBbt:00005056 Evolution of vertebrate renal anatomy appears quite conservative when compared, for example, to evolution of respiratory and cardiovascular systems in vertebrates. Major anatomical changes in vertebrates kidneys separate those of birds and mammals from kidneys of lower vertebrates. General increase in animal size from fish to mammals is reflected by an increase in total number of nephrons per kidney, rather than by constant change in tubular dimensions.[well established][VHOG]