A plan for--or a summary of--a writing project or speech. An outline is usually in the form of a list divided into headings and subheadings that distinguish main points from supporting points. Most word processors contain an outlining feature that allows writers to format outlines automatically.
Osteoblasts are bone-forming cells that descend from osteoprogenitor cells. They form a protein mixture known as osteoid, which mineralizes to become bone. Osteoid is primarily composed of Type I collagen.Osteoblasts also manufacture hormones, such as prostaglandins, to act on the bone itself.steocytes: Osteocytes are mature bone cells that originate from osteoblasts, which have migrated into and become trapped and surrounded by bone matrix, produced by themselves. The spaces they occupy are known as lacunae.
Bone cells create molecules made from proteins which are used to communicate with other bone cells. These cells are called growth factors and cytokines. These factors control cell division, differentiation, and survival of the cells.one lining cells are responsible for the immediate release of [calcium] in the bone if calcium in the blood is too low. Bone lining cells are also responsible for the protection of the bone from harmful chemicals which would eat away the bone.