NIC Barber Written (Theory) ExamScientific ConceptsEasy
A barber is performing a chemical service that requires the product to penetrate deeply into the hair shaft. Which part of the hair structure is responsible for the hair's elasticity and strength, and is the primary target for chemical alterations like perms and relaxers?
- ACuticle
- BMedulla
- CCortex
- DHair Follicle
Show answer & explanationAnswer & explanation
Correct answer: C. Cortex
The cortex is the middle layer of the hair, composed of keratin proteins, and is responsible for the hair's strength, elasticity, and contains the melanin that determines hair color. It is the primary site of chemical changes.
Why the other options are wrong
- A. The cuticle is the outermost protective layer, preventing deep penetration.
- B. The medulla is the innermost core, often absent in fine hair, and not primarily involved in chemical services.
- D. The hair follicle is the structure from which the hair grows, not part of the hair shaft itself.
Hair Cortex
The middle layer of the hair shaft, providing strength, elasticity, and containing pigment.
- Composed of keratinized cells.
- Contains melanin (color pigment).
- Site of chemical changes (perms, relaxers, color).
Memory trick: CMC: Cuticle (outside), Medulla (middle), Cortex (core strength).