What is the Renal System?
Your renal system, also called the urinary system, is made up of your kidneys and excretory organs: ureters, bladder, and urethra. Your two kidneys produce urine by filtering your blood; then, your ureters carry the urine to your bladder, and your urethra discharges the urine out of your body.
The renal system regulates the amount of water in your body, particularly in your blood. This system also controls important electrolyte concentrations in body fluids, like sodium and potassium, and removes metabolic by-products, toxins, and other foreign substances through your urine.