NIC Cosmetology Written (Theory) ExamScientific ConceptsHard
A cosmetologist is explaining the benefits of a conditioning treatment to a client whose hair is often dry and brittle. Which of the following statements best describes the primary function of the cortex layer of the hair in relation to its strength and elasticity?
- AIt contains the pigment and provides strength and elasticity.
- BIt is the innermost core, primarily responsible for medulla formation.
- CIt forms the outermost protective layer, determining porosity.
- DIt anchors the hair follicle to the scalp.
Show answer & explanationAnswer & explanation
Correct answer: A. It contains the pigment and provides strength and elasticity.
The cortex is the middle and thickest layer of the hair shaft. It contains the melanin (pigment) that determines hair color and is composed of fibrous protein structures that provide the hair with its strength, elasticity, and overall structural integrity.
Why the other options are wrong
- B. This describes the medulla, which is the innermost core (though not always present) and has no primary role in strength or elasticity.
- C. This describes the cuticle, which is the outermost layer and influences porosity.
- D. This describes the hair bulb and follicle, which are part of the hair root, not the cortex layer of the hair shaft.
Hair Cortex
The thickest middle layer of the hair shaft, composed of fibrous protein (keratin) cells. It contains melanin (pigment) and is primarily responsible for the hair's strength, elasticity, and color.
- Middle and thickest layer
- Contains melanin (pigment)
- Provides strength, elasticity, and resilience
- Composed of fibrous keratin protein
Memory trick: Cuticle Cover, Cortex Core, Medulla Middle.