Video - Renal system anatomy and physiology

The renal system, also known as the urinary system, is made up of the kidneys, ureters, bladder, and urethra. The kidneys, a pair of organs located in the back of the abdominal cavity, filter waste products from the blood in the form of urine. The urine passes down through the ureters, which are muscular tubes connecting the kidneys to the bladder. The bladder is a muscular sac that stores urine until it increases the pressure on its wall and triggers the micturition reflex. This allows the urine to flow through the urethra and out of the body.