National Physical Therapy Examination (NPTE) Practice Exam

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The nucleus pulposus of the lumbar discs primarily consists of which type of collagen?

  1. Type IV

  2. Type III

  3. Type II

  4. Type I

The correct answer is: Type II

The nucleus pulposus of the lumbar discs is composed mainly of type II collagen, which is crucial for maintaining its structure and function. Type II collagen has a unique ability to provide tensile strength and resilience, allowing the nucleus pulposus to absorb and distribute pressure within the intervertebral disc. This is essential for the disc's role in load-bearing and cushioning the spine during movement. The presence of type II collagen in the nucleus pulposus, as opposed to other types of collagen, contributes to its gel-like consistency and enables it to withstand compressive forces. This is particularly important in the lumbar region, where the discs endure significant stress and strain due to various activities such as lifting and bending. Understanding the composition of the nucleus pulposus assists in recognizing how injuries and degenerative conditions may affect disc health and function.

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