Esthetics Core Written Practice Test

Question: 1 / 400

What is keratin?

A type of skin toner

A fibrous protein that makes up the outer layer of skin and hair

Keratin is a fibrous protein that serves as a key structural component in the outer layer of skin, hair, and nails. It plays a crucial role in providing strength and resilience to these tissues, which helps protect them from damage and environmental stressors. Keratin forms a protective barrier, helping to prevent water loss and maintain hydration, making it an essential protein in the overall health and appearance of the skin and hair.

The other options do not accurately describe keratin; a skin toner is related to skin care products, natural oils pertain to lipid components in the skin, and UV filters are designed to protect against ultraviolet radiation. Thus, the description of keratin as a fibrous protein is the most accurate among the given choices, highlighting its fundamental role in dermatology and esthetics.

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A natural oil in the skin

A type of UV filter

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