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