The urinary system is composed of the kidneys, ureters, urinary bladder, and the urethra. This group of organs functions to maintain the fluid balance of the body and to filter toxic substances from the bloodstream. Urine is generated by the kidneys and carried to the bladder through the ureters.
The urinary system includes the kidneys, the ureters which join the kidneys to the bladder, the bladder itself and the urethras which permit urine collecting in the bladder to be excreted – a process termed micturition.
Overview of the Urinary System. The urinary system maintains blood homeostasis by filtering out excess fluid and other substances from the bloodstream and secreting waste.