MICROANATOMY

Detailed explanation-1: -Epithelium, endothelium and mesothelium are three types of epithelial cell layers that line your internal organs, body cavities and form the outer layer of your skin. Epithelium generally lines pathways that are open to the external environment, such as your respiratory tract and digestive system.

Detailed explanation-2: -Surface epithelium is found throughout linings and tracts of the body, while glandular epithelium may be found between surface cells and inside glands. The function of epithelia varies by cell type and location, but for the most part, epithelial tissue provides a location for protection, secretion, and absorption.

Detailed explanation-3: -Endothelium (the inner lining of blood vessels, the heart, and lymphatic vessels) is a specialized form of epithelium.