### cell:

Oocyte
* Most oocytes are in tandem arrangement.
* Some oocytes fail to resume meiosis
  - have multiple nuclei , although it is thought they never mature
* ageing before fertilization is the main factor responsible for chromosomal anomalies.
* are formed in the ovaries, a part of female reproductive system
  - gametocytes
  - produced inside the body and remain inside mesogloea waiting for fertilization
  - small, fragile and difficult to culture
* contain sporozoites.
* includes cell membranes
  - corpi
  - cytoskeletons
  - lobes
  - plasma membranes
  - sections
  - vacuoles
* is the largest human cell and is just visible to the naked eye.
* originate in the ovaries.
* provide virtually all the mitochondria of the zygote at the time of fertilization.
* range from pale yellow to white or orange and appear slightly granular.
* vastly increase in size during vitellogenesis.

### cell | oocyte:

Primary oocyte
* are formed from the oogonia in the ovary of the foetus
  - large cells produced in great number by mitosis
* begins to grow e.
* undergo vitellogenesis whenyolk is deposited in the ooplasm.

Orange cell
* hold CGI representations.
* indicate chromatic functions in minor keys only.

### cell:

Osteoblast
* also express a secreted factor called osteoprotegerin
  - influence osteoclast function
  - manufacture hormones , such as prostaglandins , to act on the bone itself
* are bone-forming cells, have an extensive endoplasmic reticulum and numerous ribosomes
  - cells active in bone formation, filling in pits of resorption
  - embryonic cells
  - normal cells that are involved in bone formation
  - prominent on the side of the trabeculae away from the lobule
* are responsible for bone formation
  - building bone matrix by producing mineral deposits
  - specialized, terminally differentiated products of mesenchymal stem cells
  - target cells for transformation in c-fos transgenic mice
* are the agent in making bone
  - cells responsible for the formation of bone
* are the cells that create new bone
  - form the matrix of the bone
  - immature bone cells
  - major cellular component of bone
  - vital for increasing bone density
* arise from mesenchymal stem cells.
* attach to the membrane, ossifying from the center of the bone outward.
* build bone
  - up bone and osteoclasts tear down bone
* can grow on such foams.
* express receptors for parathyroid hormone and control the initiation of bone resorption.
* follow along behind the osteoclasts and fill in the defects.
* form a calcium phosphate matrix and deposit salts, they then become osteocytes
  - cell layer over bone surfaces on which matrix is being formed
  - collagen and proteoglycans
* form new bone in a process called formation
  - the resorption cavity
* function in forming new bone.
* give rise to the alveolar bone around the roots of teeth.
* have receptors for parathyroid hormone and apparently for estrogen.
  - chromosomes
  - cytoskeletons
  - lobes
  - sections
* increase growth of long bones at the epiphyseal plate.
* invade the callus and convert it to bone.
* line the surface of newly forming bone matrix.
* make and secrete collagen, giving bone a measure of elasticity
  - up bone and osteoclasts break it down
* manufacture bone and are derived from mesodermal in origin.
* move in and ossify the matrix to form bone.
* produce exuberant hypervascular new bone.
* secrete alkaline phosphatase causing a rise in serum alkaline phosphatase
  - collagen which are bound together by polysaccharides
  - material inside the shaft of the cartilage model of long bones
* synthesize and secrete a collagen matrix and calcium salts.
* then move in to cover the excavated area and start the process of building new bone
  - take over and fill the holes with a material that takes a few days to harden
* try to compensate for the increased pace by rapidly depositing new bone.
* work in teams to build bone.