Which feature characterizes the keratinized stratified squamous epithelium of the skin?

• A. Dense microvilli for absorption
• B. Keratinized surface provides protection and waterproofing
• C. High turnover and absorption
• D. Secretion of mucus

Answer: (B)

Keratinization creates a tough, water-repellent surface that underpins the skin’s protective role. In keratinized stratified squamous epithelium, cells originate in the deeper layers and migrate outward, becoming filled with the protein keratin and eventually forming the dead, flattened cells of the outermost layer, the stratum corneum. This keratin-rich layer, with lipids between cells, acts as a strong barrier to abrasion, pathogens, and water loss, giving the skin its waterproofing and protective properties. Dense microvilli are not a feature of this tissue, since absorption is not the primary job of the skin; secretion of mucus is a function of mucous membranes, not keratinized skin. So the defining feature is the keratinized surface that provides protection and waterproofing.