ribonucleic acid, RNA (noun). (biochemistry) a long linear polymer of nucleotides found in the nucleus but mainly in the cytoplasm of a cell where it is associated with microsomes; it transmits genetic information from DNA to the cytoplasm and controls certain chemical processes in the cell.
Osteocytes â mature osteoblasts. Osteoclasts â bone-destroying cells. Compact bone A structural unit of a compact bone is called an osteon (or Haversian system). Osteon â cylindrical structure oriented parallel to bone's long axis.Osteon consists of hollow tubes, one inside the other, called lamella.steocytes â mature osteoblasts. Osteoclasts â bone-destroying cells. Compact bone A structural unit of a compact bone is called an osteon (or Haversian system). Osteon â cylindrical structure oriented parallel to bone's long axis.Osteon consists of hollow tubes, one inside the other, called lamella.
Bone tissue is classified into compact bone and spongy bone. The  compact bone basic unit is the osteon, or Haversian System. There  are no osteons in spongy bone, but it is â¦ composed of lamellae,  osteocytes, lacunae and canaliculi.Alexander Rowan.he  compact bone basic unit is the osteon, or Haversian System. There  are no osteons in spongy bone, but it is â¦ composed of lamellae,  osteocytes, lacunae and canaliculi.