NIC Esthetician Written ExamScientific ConceptsMedium
A client is interested in understanding the composition of their skin. They ask about the protein that provides strength and structure to the skin, hair, and nails. Which of the following proteins is the client referring to?
- AKeratin
- BElastin
- CCollagen
- DHyaluronic Acid
Show answer & explanationAnswer & explanation
Correct answer: A. Keratin
Keratin is the fibrous protein that forms the main structural component of hair, nails, and the outermost layer of the skin (epidermis), providing strength and protection.
Why the other options are wrong
- B. Elastin provides elasticity and recoil to the skin, allowing it to stretch and return to its original shape, but not primary strength and structure for hair/nails.
- C. Collagen provides tensile strength and firmness to the skin, but keratin is the specific protein for hair, nails, and the epidermal barrier.
- D. Hyaluronic acid is a humectant that attracts and holds water, providing hydration and plumpness, not a structural protein.
Keratin
A tough, fibrous, insoluble protein that is the main structural component of hair, nails, and the outer layer of the skin (epidermis), providing protection and strength.
- Primary protein of hair, nails, and epidermis
- Provides strength, resilience, and waterproofing
- Produced by keratinocytes
- Forms a protective barrier against environmental damage
Memory trick: Keratin Keeps Koverings Kstrong.