Role of Kidneys
Most people are born with two kidneys, which are each about the size of a closed fist. They are located in the middle back above the waist, with one on each side of the spine.
Kidneys serve an important role, as they are responsible for:
Kidney failure—also known as end-stage renal disease (ESRD)—is when kidneys are no longer able to do their job and the individual must either receive dialysis treatment or a kidney transplant in order to survive.