What is the primary structural component of all connective tissue?

What is the primary structural component of all connective tissue?

• A. Elastin
• B. Collagen
• C. Fibrin
• D. Actin

Answer: (B)

Collagen is the main structural component of connective tissue because it forms the strong, rope-like fibers that make up most of the extracellular matrix. This protein provides the tensile strength that lets tissues resist pulling forces, which is essential for the stability of tendons, ligaments, skin, bones, and many other connective tissues. While elastin adds elasticity in some tissues, it does not serve as the universal framework across all connective tissues. Fibrin is a clotting protein and serves a different function, not the structural matrix of connective tissue, and actin is primarily a cellular component involved in muscle contraction and cytoskeleton inside cells. So collagen, as the foundational fibrous protein of the extracellular matrix, is the primary structural component.

Collagen is the main structural component of connective tissue because it forms the strong, rope-like fibers that make up most of the extracellular matrix. This protein provides the tensile strength that lets tissues resist pulling forces, which is essential for the stability of tendons, ligaments, skin, bones, and many other connective tissues. While elastin adds elasticity in some tissues, it does not serve as the universal framework across all connective tissues. Fibrin is a clotting protein and serves a different function, not the structural matrix of connective tissue, and actin is primarily a cellular component involved in muscle contraction and cytoskeleton inside cells. So collagen, as the foundational fibrous protein of the extracellular matrix, is the primary structural component.