How does the arrangement of epithelial cells relate to their function?

• A. Randomly scattered cells provide structural support.
• B. Stacked layers of cells increase flexibility.
• C. Loosely arranged cells allow for rapid diffusion of gases.
• D. Tightly packed cells form protective barriers and control permeability.

Answer: (D)

Verified step by step guidance

1. Understand the structure of epithelial cells: Epithelial cells are tightly packed together, forming continuous sheets. This arrangement minimizes gaps between cells, ensuring a strong barrier.
2. Relate the arrangement to protection: The tight packing of epithelial cells helps create a protective barrier against physical damage, pathogens, and harmful substances. This is especially important in areas like the skin and lining of organs.
3. Consider permeability control: The close arrangement of epithelial cells also allows for selective permeability, meaning they can regulate the movement of substances like nutrients, water, and waste across the barrier.
4. Compare with other arrangements: Loosely arranged cells, such as those in connective tissue, are designed for functions like support or diffusion, not protection. This highlights the specialized role of epithelial cells in forming barriers.
5. Conclude the relationship: The tightly packed arrangement of epithelial cells is directly related to their function of forming protective barriers and controlling permeability, which is essential for maintaining homeostasis in the body.