Define epithelial tissue, state it's type and 2 characteristics of each *
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Epithelial tissue is composed of cells laid together in sheets with the cells tightly connected to one another. Epithelial layers are avascular, but innervated. Epithelial cells have two surfaces that differ in both structure and function.
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epithelial tissue are the thin tissue that cover aa the exposed surfaces of the body .they form the external skin ,the inner lining of mouth,digestive track,secretory organs etc.
there are three types of epithelial tissue
1. squamous epithelial tissue:
allows material to pass through by diffusion and filtration ,and secrets lubricating substance
2.simole cuboidal epithelium:
secrets and absorbs
3. colomnar epithelium:
it secrets enzymes and mucous
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