Colorado Cosmetology Written Practice Exam

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What is the outermost layer of the hair strand?

Cortex
Cuticle
Medulla
Stratum

The correct answer is: Cortex

The outermost layer of the hair strand is the cuticle. The cuticle consists of overlapping, scale-like cells that protect the inner layers of the hair, specifically the cortex and the medulla. This protective layer plays a crucial role in the overall health and appearance of the hair, as it helps to shield it from environmental damage and retains moisture. The cortex is the middle layer of the hair, providing strength and color due to the presence of melanin, while the medulla is the innermost layer, which is often absent in finer hair types. The term "stratum" does not specifically refer to a layer of hair, making it irrelevant in this context. Understanding the structure and function of these layers is essential for effective hair care and treatment.