Which function is NOT associated with collagen in connective tissues?

Collagen is a crucial protein found in connective tissues, primarily known for its structural roles. Its main functions include providing support to tissues and organs, enhancing the overall structure of various body parts, and contributing to the tensile strength necessary for maintaining integrity under stress.

The role of collagen in providing support involves forming a scaffold that gives tissues their shape and resilience. When it comes to enhancing structure, collagen fibers are densely packed in tissues like tendons and ligaments, contributing to their strength and helping them withstand forces.

While collagen has some capacity for flexibility, it primarily focuses on offering strength and support, rather than being notable for allowing flexibility as other proteins like elastin do. On the other hand, insulation is not a functional attribute of collagen. Insulation is typically a characteristic of adipose tissue and fat cells, which are designed to protect and insulate the body rather than provide structural support. Thus, the correct answer indicates that insulation is not a function associated with collagen.