Homo sapiens intestine cavitated compound organ kidney AAO:0000250 One of either of a pair of structures lying on either side of the dorsal aorta in which fluid balance is regulated and waste is excreted out in the form of urine.[AAO] GAID:423 Wikipedia:Kidney MESH:D007668 CALOHA:TS-0510 MAT:0000119 XAO:0003267 BTO:0000671 galen:Kidney renal UMLS:C0022646 MIAA:0000119 A paired organ of the urinary tract that produces urine and maintains bodily fluid homeostasis, blood pressure, pH levels, red blood cell production and skeleton mineralization. UBERON:0002113 reniculate kidney abdomen element lateral structure