MICROANATOMY

Detailed explanation-1: -Epithelium covers most organs and cavities within the body. It also forms a barrier to keeping different body systems separate. Epithelial cells form a thin layer of cells known as the endothelium, which is continuous with the inner tissue lining of organs such as the brain, lungs, skin, blood vessels, and heart.

Detailed explanation-2: -Epithelial tissues are widespread throughout the body. They form the covering of all body surfaces, line body cavities and hollow organs, and are the major tissue in glands. They perform a variety of functions that include protection, secretion, absorption, excretion, filtration, diffusion, and sensory reception.