Relier Pairs The urinary systemVersion en ligne The urinary system par Miguel Angel Preciado Lopez 1 What is the difference in function between renal arteries and renal veins? 2 What is the function of the ureters? 3 What happens when the bladder is full? 4 What do the kidneys do? 5 Which area does urine pass through when it leaves the bladder? It passes through the urethra. They remove waste products and water to create urine. It sends a message to the brain to tell us to urinate. The renal arteries carry blood to the kidneys to be cleaned while renal veins take the clean blood away. The ureters take urine from the kidneys to the bladder.