Which of the following is not a function of the kidney?
Removal of the undigested food
The removal of undigested food is the function of the large intestine which is a part of the digestive system and not the excretory system. The functions of the kidneys are filtration of waste products from the blood, removal of excess water from the body and erythropoietin production. Erythropoietin is a hormone produced by the kidney that promotes the formation of RBCs.