Renal is a word that refers to the kidney. Anything that is renal (renal artery, for example) is found with the kidney. And the kidney is part of the excretory system that eliminates waste from your body via the blood stream.
renal
The kidneys are the principal organ.
it belongs to the excretory system because it takes out wastes from the body
Yes.
kidneys and bladder
The genitourinary system.
The digestive system contains the liver.
Circulatory System
Digestive system.
the digestive system
skeletal system
Circulatory System.