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It has multiple functions because the epithelium contains multiple cell types which each do different things.

Generally speaking though the function of the epithelium is to secrete acid to initiate chemical digestion of food. It also secretes mucous that helps protect the epithelium from damaging effects of the acid.
genewho

The epithelial tissue is composed of cells closely linked to each other and with very little intercellular substance and lubricate the surface of the mucosa.

What is epithelial tissue?

It is made up of a set of cells that overlap each other to give life to the inner layers of different organs and outer layers of other body structures.

The epithelial tissue performs functions of protection against mechanical abrasion, absorption of nutrients, in addition to being formed by mucus-secreting lining cells that lubricate the surface of the mucosa, and protect it from possible injuries.

Therefore, we can conclude that the epithelial tissue is composed of cells closely linked to each other and with very little intercellular substance and lubricate the surface of the mucosa.

Learn more about functions of epithelial tissue here: https://brainly.com/question/857327

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