What constitutes 70% of the dermis?

Prepare for the MTA Mobility And Device Fundamentals Test. Use flashcards and answer multiple choice questions confidently. Ace your exam with thorough preparation!

The correct answer is collagen, which is a key structural protein in the dermis layer of the skin. Collagen fibers provide strength, support, and elasticity to the skin, making up about 70% of the dermal volume. This abundance of collagen is crucial for maintaining the skin's integrity and resilience, allowing it to withstand stretching and other stresses.

Elastic fibers and keratin serve different purposes within the skin. Elastic fibers contribute to the skin's elasticity but represent a smaller proportion of the dermis compared to collagen. Keratin is primarily found in the outer layer of the skin (epidermis) and plays a critical role in forming a protective barrier, but it is not a major component of the dermis itself. Adipose tissue, while important for cushioning and energy storage, is predominantly found in the subcutaneous layer beneath the dermis and not within the dermis structure.

Understanding the roles and proportions of these different components helps clarify why collagen is so significant in the context of skin anatomy and physiology.

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