Milady Cosmetology Practice Exam

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What is the principal component of hair, skin, and nails?

Collagen
Keratin
Elastin
Chitin

The correct answer is: Keratin

The principal component of hair, skin, and nails is keratin. Keratin is a type of protein that forms the structural framework for these tissues, providing strength and resilience. It is a fibrous protein that is also responsible for the protective properties of skin and the durability of hair and nails. In the case of hair, keratin gives it its hardness and helps protect it from damage. In skin, keratin contributes to the barrier function that prevents water loss and protects against environmental damage. For nails, keratin forms the tough outer layer, giving them their hardness, which is essential for protection and support. Collagen plays an important role in the structure and strength of skin, but it is not the primary component of hair and nails. Elastin contributes to the elasticity of skin but is not found in hair or nails. Chitin is a structural component found in the exoskeleton of arthropods and is not relevant to hair, skin, or nails in humans. Therefore, keratin is unequivocally recognized as the main protein that constitutes these essential human tissues.