In which tissues would you typically find stratified squamous non-keratinized epithelium?

• A. Skin epidermis
• B. In the oral cavity, esophagus, and vagina
• C. Lining of the stomach
• D. Lining of the bladder

Answer: (B)

Stratified squamous non-keratinized epithelium is layered, with surface cells that remain moist and lack a keratin layer. This arrangement provides abrasion resistance while keeping the surface lubricated, which suits sites like the moist oral cavity, esophagus, and vagina. The skin epidermis, in contrast, is keratinized to form a tough, waterproof barrier; the lining of the stomach is simple columnar epithelium specialized for secretion; and the bladder lining is transitional epithelium that stretches. Therefore, the tissues where you typically find stratified squamous non-keratinized epithelium are the oral cavity, esophagus, and vagina.