part of develops from contributes to morphology of cavitated compound organ renal system kidney XAO:0003267 BTO:0000671 galen:Kidney AAO:0000250 MIAA:0000119 GAID:423 Wikipedia:Kidney 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. MESH:D007668 CALOHA:TS-0510 MAT:0000119 reniculate kidney kidney mesenchyme kidney rudiment abdomen element upper urinary tract lateral structure