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 and spongy bones are considered the two basic structural bone types. The best explanation of the difference between the two is that the spongy bones in terms of area can be found at the head part of long bones. It also fills up the bones of an irregular type.pongy bones are also known as cancellous bones. Compact and spongy bones are the two main types of osseous tissues. Compact bones are made up of osteons. Osteons are also called Haversian systems. These osteons make the structure of compact bones.