In general, the epithelial tissue comprises of closely packed cells that may be of one or more layers. They are so closely packed till there is no intracellular spaces between them; There is only a small amount of intracellular substance.
The epithelial tissue cover and line the internal and external surfaces of the body. Endothelium on the other hand is a term used to describe epithelial tissue that occurs on the surfaces on the interior of the body.
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