Collagen provides structural support for which of the following?

• A. Skin, Ligaments, tendons, and extracellular matrix
• B. Enzymatic digestion
• C. Energy storage
• D. Transmission of nerve signals

Answer: (A)

Collagen is a fibrous structural protein that forms a strong extracellular matrix, giving tissues their shape and mechanical strength. Its main job is to provide structural support, especially in connective tissues. In the skin, collagen fibers help keep firmness and resilience; in ligaments and tendons, they supply tensile strength so these structures can stretch and transmit forces during movement; in the extracellular matrix, collagen creates a scaffold that organizes cells and other matrix components. The other options describe functions that collagen does not perform: enzymatic digestion is carried out by enzymes, energy storage is handled by fats and glycogen, and transmission of nerve signals involves neurons and myelin rather than a structural protein like collagen.