NIC Esthetician Written ExamScientific ConceptsMedium
A client is concerned about the visible signs of aging, specifically the loss of skin elasticity and the formation of fine lines and wrinkles. They ask the esthetician about the primary protein responsible for the skin's ability to stretch and recoil. Which of the following proteins should the esthetician identify?
- ACollagen
- BKeratin
- CElastin
- DFibrin
Show answer & explanationAnswer & explanation
Correct answer: C. Elastin
Elastin is a highly elastic protein in connective tissue that allows many tissues in the body to resume their shape after stretching or contracting. It is a key component of the skin's elasticity.
Why the other options are wrong
- A. Collagen provides tensile strength and structure, not primary elasticity.
- B. Keratin provides toughness and is the main component of hair and nails, and the stratum corneum.
- D. Fibrin is a protein involved in blood clotting, not skin elasticity.
Elastin Function
Elastin is a highly elastic protein found in connective tissue, particularly in the dermis, that allows skin, ligaments, and other tissues to stretch and return to their original shape.
- Provides resilience and flexibility to the skin.
- Degrades with age and sun exposure.
- Forms elastic fibers in the dermis.
Memory trick: Elastin makes skin elastic, like stretching a rubber band.