Final answer:
Epithelial tissues line body surfaces, cavities, and organs, serving crucial protective and absorptive functions.
Explanation:
Epithelial tissues are made of closely-packed cells arranged in flat sheets, forming the surface of the skin, lining various cavities and tubes in the body, and covering internal organs. They are categorized by shapes such as squamous, columnar, and cuboidal, and can be organized in single or multiple cell layers. Epithelial cells line hollow organs, various body cavities, surfaces of blood vessels, and serve as the interface between internal and external environments.
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