Which location is associated with simple squamous epithelium?

• A. Glandular tissue of the pancreas
• B. Muscle tissue of the heart
• C. Alveolar walls of the lungs
• D. Stratified squamous epithelium of the skin

Answer: (C)

Simple squamous epithelium is a single layer of flat cells that forms very thin barriers, ideal for diffusion and filtration. The alveolar walls of the lungs are lined by this type of epithelium, creating a minimal barrier that allows quick exchange of oxygen and carbon dioxide between air in the alveoli and blood in the surrounding capillaries.

The pancreas’ glandular tissue is secretory and typically lined by simple cuboidal to columnar epithelium, not flat squamous. The heart is made of cardiac muscle tissue, not epithelial. The skin is protected by stratified squamous epithelium, which has multiple cell layers. So the alveolar walls of the lungs best illustrate simple squamous epithelium.