Colorado Cosmetology Written Practice Exam

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Which layer of hair provides strength and elasticity to human hair?

Cuticle
Medulla
Cortex
Hair Follicle

The correct answer is: Cuticle

The cuticle is the outermost layer of hair that acts as a protective barrier and provides strength and elasticity. The medulla is the innermost layer of hair, but it mainly serves as a channel for nutrients. The cortex is the middle layer that contains pigment and gives hair its texture and strength, but it is not the main source of strength and elasticity. The hair follicle is the structure from which hair grows and it does not directly contribute to the strength and elasticity of the hair itself. Therefore, the best answer is the cuticle.