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 happens when the bladder is full? 4 What do the kidneys do? 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. The ureters take urine from the kidneys to 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.