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.
The basic functional unit of compact bone is the osteon (Haversian system). The osteon consists of concentric lamellae of bone matrix arranged around a central (Haversian) canal containing blood vessels. The osteons are cylindrical and aligned parallel to the long axis of the bone.he basic functional unit of compact bone is the osteon (Haversian system). The osteon consists of concentric lamellae of bone matrix arranged around a central (Haversian) canal containing blood vessels. The osteons are cylindrical and aligned parallel to the long axis of the bone.