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.
Cortical bone is dense and forms the surface of bones. It is solid in appearance, and constitutes as 80% of total bone mass. Compact bone is composed of many cylinder shaped units called osteons, or Haversian Systems (after the anatomist who discovered them.).Spongy Bone: Cancellous bone is a type of osseous tissue with a low density and strength but very high surface area, that fills the inner cavity of long bones.Cancellous bone lies between two layers of compact bone, and this helps contribute to bone strength. As you can guess by it's name, it looks spongy, or porous.ortical bone is dense and forms the surface of bones. It is solid in appearance, and constitutes as 80% of total bone mass. Compact bone is composed of many cylinder shaped units called osteons, or Haversian Systems (after the anatomist who discovered them.).