A kidney, ureter and urinary bladder together are called-
(a) Respiratory system
(b) Excretory system
(c) Circulatory system
(d) Reproductive system

Correct Answer: (b) Excretory system

Explanation:

A kidney, ureter, and urinary bladder together are called the excretory systems. Nephrons are the basic filtration unit present in the kidney.

Excretory system of human beings: