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Functions of epithelium

Specify some of the functions of epithelium?

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The epithelial tissues may perform the impermeability, covering and protection against the environment, such as, in the skin, reabsorption, as in the guts and renal tubules, gas exchange, e,g. thermal regulation, the amphibian skin, such as secretion of substances, sweating, just as in the epithelium of the glands. In some animals, the skin also has an vital function of the camouflage and mimicry.

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