Wisconsin Esthetics State Board Practice Test 2025 – Comprehensive Exam Prep

Collagen is a crucial protein that provides structure, strength, and elasticity to the skin. It represents a significant component of the dermis, the layer of skin located beneath the epidermis. Approximately 70% of the dermis is made up of collagen fibers. This high percentage of collagen is essential for maintaining the skin's firmness and resilience, contributing to its overall youthful appearance.

In contrast, the other percentages provided do not accurately reflect the typical composition of the dermis. For example, if only 30% or 50% of the dermis were collagen, the skin would lack the structural integrity that is characteristic of healthy skin. Having 90% collagen would also be unrealistic, as it would imply a reduced presence of other important components, such as elastin, ground substance, and various cells that also play vital roles in skin health and function. Therefore, the accurate understanding of collagen's composition in the dermis is crucial for estheticians when considering skin treatments and maintaining skin health.