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•Epithelium (plural, epithelia) is the tissue that covers and lines both the external and internal body surfaces, including vessels and small cavities. Epithelium not only serves as a protective covering or lining but is also involved in tissue absorption, secretion, sensory, and other specialized functions.
•It serves to protect the more complex inner structures from physical, chemical, and pathogenic attack, as well as dehydration and heat loss by its formation as an epithelial barrier.
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