What type of collagen primarily makes up the lumbar disc and is responsible for resisting compressive forces?

• A. Type 1
• B. Type 2
• C. Type 3
• D. Type 4

Answer: (B)

Type 2 collagen is primarily found in the lumbar disc and is especially crucial for resisting compressive forces. This type of collagen is abundant in cartilage and the nucleus pulposus of intervertebral discs, contributing to their biomechanical properties. Type 2 collagen fibers provide tensile strength and resilience, allowing the discs to accommodate and distribute loads effectively during various movements and activities.

The nucleus pulposus, which is the inner gel-like material of the disc, relies on Type 2 collagen along with proteoglycans to maintain hydration and elasticity. This composition allows the discs to withstand the compressive forces encountered during activities such as lifting and bending, ensuring stability and function of the spine. In contrast, Type 1 collagen is found in other structures, such as tendons and ligaments, where tensile strength is more critical, and types 3 and 4 collagen are typically associated with other connective tissue roles and do not play a significant role in the mechanical properties of the lumbar disc.