The kidneys remove liquid waste from the blood in the form of urine, keep a stable balance of salts and other substances in the blood, and produce erythropoietin, a hormone that aids the formation of red blood cells.
(The kidneys; remove; liquid waste; from the blood) (The kidneys; keep; a stable balance of salts and other substances in the blood) (The kidneys; produce; erythropoietin) (a hormone; aids; the formation of red blood cells)
The kidneys The kidneys The kidneys a hormone
remove keep produce aids
liquid waste from the blood
a stable balance of salts and other substances in the blood
erythropoietin
the formation of red blood cells