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.
Compact bone is made up of concentric rings of matrix that surround central canals which contain blood vessels, embedded in this bone tissue are small cave-like spaces called lacunae (contain osteocytes cells), which are connected to each other through small tunnels called canalicula.one tissue is a kind of connective tissue that holds lots of calcium and phosphorous salts. About 25% of bone tissue is composed of water while another 25% is made up of protein fibers like collagen. The other 50% of bone tissue is a combination of mineral salts, mainly calcium and phosphorous.