Which term refers to fibers that are numerous in connective tissue and provide flexibility and strength?

• A. Extracellular Matrix
• B. Loose Connective Tissue
• C. Dense Connective Tissue
• D. Collagen Fibers

Answer: (D)

Collagen fibers are the fibrous threads most abundant in connective tissue and are the main source of tensile strength. They’re produced by fibroblasts and assemble into thick, wavy bundles made of collagen molecules that resist pulling forces in multiple directions. This gives tissues like skin, tendons, and ligaments their sturdy, load‑bearing properties while still allowing some degree of flexibility. The extracellular matrix includes collagen fibers but is the larger framework around cells, not the fibers themselves. Dense connective tissue is rich in these fibers, whereas loose connective tissue has fewer fibers and more ground substance. Elastic fibers provide elasticity, not the primary tensile strength described here. Therefore, collagen fibers best fit the description.