Stratified squamous tissue is typically found in which areas?

• A. Cardiac muscle
• B. Liver
• C. Skin and lining of the digestive tract
• D. Blood vessels

Answer: (C)

Stratified squamous epithelium is a multi-layered, protective tissue designed to resist abrasion. The surface cells are flat and packed to shield underlying tissues from friction and wear. Because of this role, you find it in the skin, where it forms a keratinized, waterproof outer layer, and in moist mucosal areas that endure rubbing, such as portions of the digestive tract that experience abrasion (notably the esophagus). Most of the digestive tract, like the stomach and intestines, is lined by simple columnar epithelium, but regions that face more stress use stratified squamous.

In contrast, cardiac muscle is muscle tissue, the liver is a glandular organ, and blood vessels are lined by a single layer of flat cells (endothelium), not stratified. So the best fit for where this tissue is typically found is the skin and the portions of the digestive tract that require protection from wear.