Study the following statements about the human excretory system.

I. The waste materials dissolved in water are separated in the kidney as urine.

II. Urine is stored in the bladder. It is passed out through the urethra, the other end of which is attached to the urinary aperture.

III. Urine passes into the bladder through the urinary ducts.

IV. Useful substances are reabsorbed into the blood.

V. Blood containing both useful and harmful substances reaches the kidneys for filtration.

The correct sequence of processes given in the above statements is: