A microscopic structural unit of compact bone is called an osteon. Look at the components of an osteon in the choices below. Select the option where the component is NOT correctly matched with its function.
1) Central canal - central opening made for blood vessels and nerves
2) Canaliculi - bone cells found in lacunae
3) Lacunae - houses osteocytes
4) Concentric lamella - concentric rings of bone matrix