Red Seal Cosmetology Practice Exam

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What is the innermost layer of the hair known as?

Cortex
Cuticle
Medulla
Follicle

The correct answer is: Medulla

The innermost layer of the hair is known as the medulla. The medulla is the soft, central part of the hair shaft that is made up of cells filled with air spaces and pigment. The cortex and cuticle are both outer layers of the hair, with the cortex being the middle layer of hair made up of keratin and providing the hair's strength and elasticity, and the cuticle being the outermost layer of hair that serves as a protective barrier. The follicle is the structure from which the hair grows, and while it is important for hair growth, it is not the innermost layer of the hair.