What is the primary role of the urinary system?

The primary role of the urinary system is to filter blood and maintain fluid balance. This system is essential for removing waste products and regulating the composition of body fluids by filtering excess substances from the bloodstream, which are then excreted as urine. The kidneys, which are the main organs of the urinary system, play a crucial role in this process by selectively reabsorbing water and essential ions while allowing waste materials to be eliminated.

Additionally, the urinary system helps regulate electrolyte levels, blood pressure, and the acid-base balance of the body. Through these functions, it contributes significantly to homeostasis, ensuring that the internal environment remains stable despite external changes.