What type of epithelium lines large ducts of many glands and parts of the reproductive tract?

• A. Stratified columnar epithelium (in some ducts and urethra)
• B. Simple columnar epithelium
• C. Stratified cuboidal epithelium
• D. Pseudostratified ciliated columnar epithelium

Answer: (A)

Stratified columnar epithelium provides a durable, protective lining for areas where ducts carry secretions and where the reproductive tract experiences friction or wear. Multiple cell layers with tall surface cells give strength, while the columnar surface cells can participate in secretion and lubrication as secretions move through the ducts. This combination makes it the typical lining for large ducts of many glands and for parts of the reproductive tract. Simple columnar would be too delicate and is suited to absorption and secretion in single-layer epithelia; pseudostratified ciliated columnar lines mainly the respiratory tract and some male ducts but not the broad, multi-layered lining of large ducts; stratified cuboidal is restricted to certain excretory ducts and doesn’t broadly describe the reproductive tract.