Washington Master Esthetics Practice Exam

What is the function of keratin in the skin?

1. Provide elasticity

2. Prevent water loss

3. Give structural support

4. Filter UV radiation

The correct answer is: Prevent water loss

Keratin serves as a crucial protein in the skin, primarily providing a barrier that helps to prevent water loss. This protein is found in the outer layer of the skin, known as the epidermis, where it contributes to the formation of a protective layer that reduces permeability. By doing this, keratin ensures that moisture is retained within the skin, which is vital for maintaining hydration and overall skin health. This water-retentive quality is essential in preventing dehydration and helps to keep the skin plump and resilient. While the other functions mentioned, such as providing elasticity, giving structural support, and filtering UV radiation, are important aspects of skin health and integrity, they are not the primary function of keratin. Elasticity is primarily provided by collagen and elastin in the deeper layers of the skin; structural support is also more influenced by collagen fibers, and while some keratin can help with a degree of UV protection, keratin's main role is distinctly centered around moisture retention and barrier protection.