A & P

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A & P
2013-02-08 19:29:22
Chapter Four

The Tissue Level of Organization
Show Answers:

  1. What are the 4 types of tissue in our body?
    • 1. Epithelial tissue
    • 2. Connective tissue
    • 3. Muscle tissue
    • 4. Neural tissue
  2. Where is epithelial tissue generally found?
    Epithelia form the surface of the skin and line the digestive, respiratory, reproductive and urinary tracts--the line all passageways that communicate with the outside world.
  3. What are the characteristics of epithelia?
    • 1. Cellularity- composed almost entirely of cells bound closely together by interconnections called cell junctions.
    • 2. Polarity- there are structural and functional differences between the exposed and attached surfaces.
    • 3. Attachment- the base is bound to a thin basal lamina
    • 4. Avascularity- meaning they lack blood vessels.
    • 5. Regeneration- cells that are damaged or lost at the exposed surface are continuously replaced through stem cell divisions; rate of regeneration is much higher in epithelia than any other tissues.
  4. What are the functions of epithelia?
    • 1. Provide physical protection- from abrasion, dehydration and destruction by chemical or biological agents.
    • 2. Control permeability- any substance that enters or leaves your body must cross an epithelium.
    • 3. Provide sensation- sensory nerves continually provide information about the external and internal environments.
    • 4. Produce specialized secretions- epithelial cells that produce secretions are called gland cells.
  5. Specializations of Epithelial Cells