what do the kidneys do
The kidneys are an essential part of the urinary system and also serve homeostatic reasons such as the regulation of blood pressure and acid-base balance. They take out waste such as urea and ammonium; also responsible for reabsorpitation of water, glucose, and ammonium acid. Filtering out wastes to be excreted in the urine. 2  Regulating blood pressure via both urinary excretion of wastes and initiating the renin-angiotensen hormone regulatory system. 3  Regulating an acid-base balance via the bicarbonate system. 4  Stimulating red blood cell production via the release of the hormone erythropoietin.