PSI Barbering Practice Exam

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What percentage of the total weight of the hair comes from the cortex?

  1. Less than 10%

  2. 10% - 25%

  3. 25% - 50%

  4. Over 50%

The correct answer is: Less than 10%

The cortex is the middle layer of hair and plays a significant role in determining the hair's strength, elasticity, and overall health. This layer comprises approximately 75% to 90% of hair's total weight, making it crucial for its structural properties. Understanding the composition of hair is essential for effective hair care, coloring, and styling practices in barbering. Considering this, the correct choice reflects that the cortex contributes predominantly to the hair's weight. Hence, indicating that the majority of the weight comes from the cortex aligns with the understanding that it is the most substantial component of the hair structure. The options that state lower percentages do not accurately reflect the anatomical importance of the cortex and its contribution to the overall weight of the hair. It is a misconception to think that the cortex's contribution could be less than a limited range.

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