The renal system, also known as the urinary system, is responsible for filtering blood and producing urine. It consists of the kidneys, which remove waste and excess substances, the ureters that transport urine to the bladder, and the urethra, which expels urine from the body. The kidneys play a crucial role in maintaining the body's fluid balance, electrolyte levels, and blood pressure. They also help regulate the body's pH levels and produce hormones like erythropoietin, which stimulates red blood cell production. Proper functioning of the renal system is essential for overall health.