What is one function of the urinary system?

The function of maintaining water and electrolyte balance is a critical role of the urinary system. This system filters blood to remove waste products and excess substances, which includes the regulation of fluids and electrolytes such as sodium, potassium, and calcium. When the kidneys filter the blood, they reabsorb the necessary amounts of water and electrolytes back into circulation while excreting the surplus in urine. This process helps maintain homeostasis, which is essential for the body’s overall functioning. By controlling the volume and composition of body fluids, the urinary system plays a vital part in ensuring that cells operate optimally and that the body's fluid balance is preserved.