PSI Barbering Practice Exam

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What is the hair shaft primarily composed of?

Living cells
Minerals
Keratinized protein
Water

The correct answer is: Keratinized protein

The hair shaft is primarily composed of keratinized protein, which is a tough, fibrous protein that provides structure and strength to the hair. Keratin is a key component of hair, forming a protective layer that allows the hair to resist damage and maintain its integrity. This composition is crucial for the overall health and durability of hair, contributing to its elasticity and resilience. Living cells are found in the hair follicle, not in the hair shaft itself, which is made up of dead cells that have undergone a process of keratinization. Minerals and water do play roles in overall hair health, but they do not constitute the primary structural component of the hair shaft. The protein structure of keratin is what defines the properties of hair, including its texture, thickness, and ability to withstand various styling techniques.