A & P
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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?
- composed almost entirely of cells bound closely together by interconnections called
- there are structural and functional differences between the exposed and attached surfaces.
- the base is bound to a thin basal lamina
- meaning they lack blood vessels.
- 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?
Provide physical protection
- from abrasion, dehydration and destruction by chemical or biological agents.
- any substance that enters or leaves your body must cross an epithelium.
- sensory nerves continually provide information about the external and internal environments.
Produce specialized secretions
- epithelial cells that produce secretions are called
Specializations of Epithelial Cells
A & P
The Tissue Level of Organization