Simple squamous epithelium lines blood vessels, lung alveoli, the oesophagus, the mouth lining, and the skin.

Simple squamous epithelium facilitates transportation of substances through selectively permeable surfaces.

Epithelial tissue plays a crucial role in maintaining the integrity of different body systems by forming protective layers that prevent the mixing of fluids and tissues, ensuring proper functioning and specialization of various organs and structures.

Epithelial tissue forms a barrier that protects underlying tissues from mechanical damage, pathogens, and chemical agents, thereby safeguarding the integrity and function of organs and body cavities.

Epithelial tissue is usually separated from underlying tissues by an extracellular fibrous basement membrane.