New Jersey Cosmetology and Hairstyling Practice Exam

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Prepare for the New Jersey Cosmetology and Hairstyling Exam with multiple choice questions and flashcards. Study with hints and explanations to succeed!

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What constitutes 90% of hair's weight and is responsible for its strength and elasticity?

Cuticle
Cortex
Epidermis
Sebaceous glands

The correct answer is: Cortex

The cortex is the middle layer of the hair shaft and makes up approximately 90% of the hair's weight. It consists of long tightly packed keratin fibers that provide strength and flexibility to the hair. The other options are incorrect as they do not play a significant role in the weight, strength, or elasticity of the hair. The cuticle is the outer layer that protects the hair from damage, the epidermis is the outer layer of skin, and the sebaceous glands produce oils for the hair and skin.