Describe the excretory system in humans.

Excretory system of humans consists of a  pair of kidneys, a pair of ureters, urinary bladder and urethra. Kidneys are located in the abdomen. The nephrons are the structural and functional units of kidneys. They produce and concentrate the urine. The urine is carried to the urinary bladder by the ureters. The urine is stored in the bladder and released out through the urethra.