Mississippi Cosmetology Board Practice Exam

What protein is the structure of hair primarily composed of?

1. Collagen

2. Keratins

3. Elastin

4. Actin

The correct answer is: Keratins

Hair is primarily composed of a protein called keratin, which belongs to a family of fibrous structural proteins. Keratin is crucial for forming the hair's structure and is responsible for its strength and resilience. It creates a protective barrier that safeguards the hair from environmental damage and mechanical stress. This protein also provides the characteristic rigidity that helps maintain the shape of hair strands, making it unique compared to other proteins. Other proteins mentioned, such as collagen and elastin, serve different functions in the body. Collagen is predominantly found in connective tissues, providing structure and support to muscles, bones, and skin. Elastin, on the other hand, gives tissues the ability to stretch and recoil, playing a role in the elasticity of skin and other organs. Actin is primarily a component of muscle fibers involved in contraction and movement, not relevant to the makeup of hair itself. Understanding the specific role of keratin in hair structure can help in choosing appropriate hair care products and treatments designed to enhance and protect hair health.