Renal System:- (Urinary System)                                   
 - The urinary system is composed of:
1. Two kidneys.            2. Two ureters.                  
3. Urinary Bladder.      4. Urethra.
- The kidney plays a major role in controlling the volume of blood(water) and also controlling ion concentration and PH.

- The kidney is a major excretory organ, responsible for the removal of metabolic waste products from the blood

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