What is the Difference Between Endothelial Cells and Epithelial Cells?

Endothelial cells and epithelial cells are distinct cell types that have precise functions in the body. Epithelial cells form the covering surfaces and lining cavities throughout the body. They form the skin (the largest tissue in the body), line organs like the stomach and lungs, and create protective barriers. Their main functions include protection, absorption, secretion, and filtration. For example, the epithelial lining of the intestine helps absorb nutrients, while the skin protects against external damage. These cells can be arranged in multiple layers and come in different shapes depending on their function.