A columnar epithelial cell probably has what function?

• A. Abrasion resistance
• B. Regeneration and regular replacement of cells
• C. Exchange of materials by diffusion
• D. Debris collection
• E. Absorption and secretion

Answer: (E)

Verified step by step guidance

1. Understand the structure of columnar epithelial cells: These cells are elongated and column-shaped, which provides a large surface area relative to their volume.
2. Recognize the location of columnar epithelial cells: They are commonly found lining the intestines and respiratory tract, areas where absorption and secretion are crucial functions.
3. Identify the primary functions of columnar epithelial cells: Their structure is optimized for absorption and secretion, allowing efficient uptake of nutrients and secretion of mucus or enzymes.
4. Consider the presence of microvilli: Many columnar epithelial cells have microvilli on their surface, which further increases the surface area for absorption.
5. Relate the function to the cell's environment: In the intestines, columnar epithelial cells absorb nutrients from digested food, while in the respiratory tract, they secrete mucus to trap debris and pathogens.