Wikijunior:Biology/Systems/Urinary System

The Urinary System
The urinary system takes harmful things out of the blood and washes it out of the body. This liquid waste is called urine. Without the urinary system, bad chemicals would remain in the blood and cause serious damage to the body. The kidneys are organs in the urinary system that filter the blood and remove these chemicals. Urine is stored in a bag called the bladder and it leaves the body through a tube called the urethra.