Question

What is the difference between epithelial and epithelium tissue?

Answer 1

The main difference between epithelial and endothelial cells is that epithelial cells line both internal surfaces and external surfaces of the body whereas endothelial cells line the internal surfaces of the components of the circulatory system.

But, endothelial cells are made up of simple squamous epithelium.

Answer 2

Explanation:

The thin tissue forming the outer layer of a body's surface and lining the alimentary canal and other hollow structures is the epithelium.

Membranous tissue composed of one or more layers of cells separated by very little intercellular substance and forming the covering of most internal and external surfaces of the body and its organs are epithelial. i.e, Epithelial means of or belonging to epithelium.

OR

The main difference between epithelial and endothelial cells is that epithelial cells line both internal surfaces and external surfaces of the body whereas endothelial cells line the internal surfaces of the components of the circulatory system. ... But, endothelial cells are made up of simple squamous epithelium.