What is the primary role of columnar cells in epithelial tissue?

Columnar cells in epithelial tissue primarily function to secrete enzymes and mucus, making this the correct answer. These cells are characterized by their tall and column-like shape, which is well-suited for their role in various organs, such as the digestive tract, where they aid in digestion and absorption by producing mucus that protects the underlying tissues and facilitates the movement of food.

In the respiratory tract, columnar epithelial cells, often ciliated, help trap and expel pathogens and debris, further emphasizing their secretory role. The secretion of mucus creates a protective layer while also enabling other functions such as lubrication and the transport of materials across the epithelial surface.

It’s important to note that while other types of cells in epithelial tissue may provide structural support, protection from abrasion, or serve as barriers against pathogens, columnar cells are specifically adapted for secretion and absorption, highlighting their unique and vital role in the functioning of various systems within the body.