noun, plural: epithelia

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


Epithelium is one of the major types of animal tissues. Aside from its protective role, it is also involved in secretion, regulation, and absorption. Epitelium may be classified based on the shape of its cells and on the number of layers it is made up of.

Word origin: Greek epi (on, atop) + Greek thele (nipple)



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