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What are the 4 types of tissue in our body?
- 1. Epithelial tissue
- 2. Connective tissue
- 3. Muscle tissue
- 4. Neural tissue
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.
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.
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.
Specializations of Epithelial Cells
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