Which fibers are thinner collagen fibers that provide strength and are the least common?

• A. Elastic fibers
• B. Adipocytes
• C. Reticular fibers
• D. Lymphocytes

Answer: (C)

In connective tissue, fibers vary in thickness and function. The thinnest collagen-type fibers that still contribute structural support are reticular fibers. Made of type III collagen and coated with glycoproteins, they don’t form strong bundles like type I collagen but instead weave into delicate networks that provide a supportive mesh for cells and tissues. This reticular framework is especially important in lymphoid organs, bone marrow, liver, and spleen, where it helps hold parenchymal cells in place and allows cell movement and exchange. Because reticular fibers are thin and form a fine network, they’re less abundant overall than the thicker collagen bundles of type I collagen and the elastic fibers, making them the least common among the options. The other choices aren’t fibers: adipocytes are fat cells, and lymphocytes are immune cells; elastic fibers, while also thin, primarily confer elasticity rather than forming the reticular supportive mesh described here.