Maine Barber Practice Exam 2026 - Free Barber Practice Questions and Study Guide

The cortex is the part of the hair responsible for its strength. It is the thickest layer of the hair shaft and contains proteins like keratin, which provide structural integrity and resilience. The cortex also houses pigments that determine hair color, further contributing to the overall characteristics of hair.

In contrast, the cuticle serves as the outer protective layer, helping to guard against damage but does not significantly contribute to the hair's strength. The medulla, which is the innermost layer, is not present in all hair types and does not play a key role in overall strength. The follicle, although crucial for hair growth, is part of the skin and not the hair itself. It is responsible for anchoring the hair in place and supporting its development rather than contributing to its strength.