Oregon Cosmetology Certification Practice Exam

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Prepare for the Oregon Cosmetology Certification Exam. Study with flashcards and multiple choice questions, each with hints and explanations. Get ready for your exam!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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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.