is an organ pair and each kidney is located on each side at the back of the abdomen
. It acts as a blood
filter and eliminates certain compounds that are passed in the urine. It also helps regulate the amount of water present in the body. A portion of the filtered water is reabsorbed for the functioning of the body, and another part is released into the urine. The kidney also regulates the amount of minerals to prevent deficiencies
or excesses. It also produces and secretes hormones such as renin, involved in the regulation of blood pressure
, and erythropoietin
secretion of red blood cells
by the bone marrow
. The presence of only one functional kidney is compatible with life, but in case of advanced kidney disease, transplantation should be considered.