What does the urinary system do and how does it function in the human body?

The urinary system removes waste and excess substances from the blood, producing urine that is excreted from the body. It consists of the kidneys, ureters, bladder, and urethra. The kidneys filter blood to remove waste and regulate fluid balance, while the ureters transport urine to the bladder. The bladder stores urine until it is expelled through the urethra. This system helps maintain proper balance of fluids and electrolytes in the body.