The primary function of the urinary system is to filter and remove waste products from the bloodstream while regulating water and electrolyte balance in the body. This system consists of the kidneys, ureters, bladder, and urethra. The kidneys play a critical role in filtering blood to create urine, which contains waste substances. The ureters transport urine from the kidneys to the bladder, where it is stored until excretion. When the bladder is full, urine is expelled from the body through the urethra. Additionally, the urinary system helps regulate blood pressure and maintain acid-base balance.