### cell:

Basal cell
* Every basal cell is attached to a melanocyte.
* ceep dividing but stop differentiating into columnar and goblet cells.
* continue to divide until the epithelial stratification is restored.
* make up the base of the epidermis, the outermost covering of the body.
* occur in smaller numbers and are located in the lowest part of the epidermis.
* regenerate the two other cell types.

### cell:

Beta cell
* are cells
  - unique cells in the pancreas that produce, store and release insulin
  - very sensitive to the amount of glucose in the bloodstream
  - well preserved
* have a vital job
  - channels in their plasma membrane that serve as glucose detectors
* occur in clusters called islets, so they are also known as islet cells.
* produce insulin and alpha cells produce glucagon
  - insulin, which helps blood sugar get into the body's cells, where it's needed
  - proinsulin
  - the insulin that turns the body's glucose into the energy of life
* secrete insulin.

Blastomere
- embryology
* become motile.
* move relative to one another.
* sit on top of yolk.

Blue cell
* hold the visible symbols.
* indicate the times when labs close.
* reprensent the progeny of one of the MBNbs.

### cell:

Cancerous cell
* Some cancerous cells move and attack other parts of the body.
* are more active and reproduce at an abnormally high rate.
* can enter the lymphatic system and move around the body, infecting other organs
  - invade the spinal cord, the brain and other organs
* contain more protein than normal cells.
* crowd out the normal cells in the bone marrow.
* demonstrate invasion of surrounding tissues.
* depend on the rapid growth of new blood vessels to grow.
* feed on animal protein, which triggers the abnormal proliferation of cells.
* grow out of control and take over the normal functions of the body.
* interfere with the growth and functions of normal cells.
* lose that differentiation.
* produce telomerase naturally and proliferate without limit.
* replace normal white blood cells known as lymphocytes.
* thrive on animal protein and fat whereas body cells thrive on complex carbohydrates.

Chief cell
* contain abundant rough endoplasmic reticulum in their basal cytoplasm.
* produce digestive enzymes that break down food
  - parathyroid hormone
* store their secretory product intracellularly as inactive zymogen granules.
* synthesize and secrete pepsinogen, a precursor of the enzyme pepsin.

### cell:

Choanocyte
* are found lining the spongocoel
  - located in the interior part of the sponge
  - vase shaped cells with a collar of fine fibrils connected by microvilli
  - versatile cells
  - very similar in structure to choanoflagellate protozoa
* can transform to become male sex cells, or oocytes.
* flagellated cell
* function to take food and bacteria through phagocytosis.
* give rise to egg and sperm cells, and archaeocyte cells also give rise to egg cells.
* have flagella that propel water through the body.
* includes cell membranes
  - chromosomes
  - corpi
  - cytoskeletons
  - lobes
  - nuclei
  - plasma membranes
  - sections
  - vacuoles
* line the radial canals
  - spongocoel and filter nutrients out of the water
* move water through flagellar movement.

Ciliated cell
* are an integral part of the pulmonary defense
  - frequent
* have longer microvilli interspersed between cilia.

Collenchyma cell
* are elongated cells with unevenly-thickened walls
  - long narrow cells with thick, strong, yet extensible, cell walls
  - still alive at functional maturity - thus they can grow as the plant grows
  - useful in support in young parts of the plant that are growing quickly
* have thick primary walls composed of cellulose.
* provide support to growing plant parts.
* retain their living contents at maturity.
* support the plant.