Kansas Cosmetology Practice Exam

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What is the primary function of the cuticle in hair?

Enhances the hair's shine
Protects the inner layers of the hair shaft
Assists in maintaining hair color
Promotes hair growth

The correct answer is: Protects the inner layers of the hair shaft

The primary function of the cuticle in hair is to protect the inner layers of the hair shaft. The cuticle is made up of overlapping, scale-like cells that form a protective barrier around the cortex and medulla of the hair. This outer layer helps to prevent damage from environmental factors such as pollution, UV rays, and heat styling. When the cuticle is intact, it helps to keep the hair strong and healthy by preventing moisture loss and protecting against chemical damage. While the cuticle can influence the appearance of shine and may play a role in how hair interacts with color treatments, its primary and most important role is safeguarding the inner structures of the hair, ensuring its integrity and longevity. Other choices, such as promoting hair growth or assisting in maintaining hair color, do not accurately align with the direct protective function of the cuticle.