Which tissue lines the large ducts of exocrine glands, offering a conduit and barrier?

• A. Dense Connective Tissue
• B. Loose Connective Tissue
• C. Stratified Columnar
• D. Stratified Cuboidal

Answer: (C)

Lining large exocrine ducts with stratified columnar epithelium provides both a sturdy conduit for secretions and a protective barrier. As ducts enlarge, a single-layer lining isn’t enough to withstand the mechanical flow and potential irritants of the lumen. Multiple layers add durability, and the tall columnar cells help maintain a clear lumen and polarity, supporting efficient transit of secretions while protecting the underlying tissue. Connective tissue surrounds and supports ducts but does not line the lumen, and other epithelial types don’t offer the same combination of protection and conduit needed for the largest ducts.