what is eppitial tissue
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Answer:
Epithelium is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue. Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs.
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The epithelial tissue (also called epithelium) is a membranous animal tissue made up of one or more layers of cells closely packed together and serves as a covering of internal and external surfaces of the body, including bodily cavities and vessels.
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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