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Epithelial tissue provides four key functions, they provide protection, they control permeability, they provide sensation, and they produce secretions. Our skin is a great example of an epithelial tissue that protects our body, It is made up of lots of layers of cells.
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Functions of epithelial cells include secretion, selective absorption, protection, transcellular transport, and sensing. Epithelial layers contain no blood vessels, so they must receive nourishment via diffusion of substances from the underlying connective tissue, through the basement membrane.
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