Which epithelium lines large ducts of sweat glands?

• A. Stratified cuboidal epithelium
• B. Simple cuboidal epithelium
• C. Stratified columnar epithelium
• D. Pseudostratified columnar epithelium

Answer: (A)

The key idea is how duct lining adapts to a gland’s duct size. Large ducts of sweat glands are lined by stratified cuboidal epithelium, which means more than one layer of cube-shaped cells. This arrangement provides extra protection and structural stability as the duct functions as a conduit for sweat moving from the secretory part to the surface. The cuboidal shape supports secretion and absorption tasks within the duct, while the multiple layers protect the duct lining from friction and mechanical stress as the duct enlarges.

Simple cuboidal epithelium would be typical for smaller ducts or secretory portions, where a single layer suffices for function. Stratified squamous epithelium lines surfaces exposed to abrasion, like skin or oral mucosa, not the interior lining of large ducts. Stratified columnar epithelium is less common and occurs in some larger ducts but not specifically the large ducts of sweat glands. Pseudostratified columnar epithelium lines certain respiratory and reproductive ducts, but not the main large ducts of sweat glands.