Final answer:
The urinary system maintains fluid balance by filtering the blood and eliminating excess water through urine.
Step-by-step explanation:
The urinary system maintains an appropriate fluid balance by filtering the blood and eliminating excess water from the body through urine.
It also helps in maintaining homeostasis of mineral ions in extracellular fluid, regulating acid-base balance in the blood, regulating the volume of extracellular fluids, and controlling blood pressure.