Arkansas Barber Practice Exam

The composition of hair is primarily made of keratin, which is a type of protein. Keratin serves as a key structural material that makes up the outer layer of human skin, hair, and nails. It provides strength and resilience, allowing hair to maintain its structure and resist damage from environmental factors, such as UV radiation and chemical treatments. While collagen is a protein found in connective tissues that provides structure and elasticity, it is not a primary component of hair. Elastin, another type of protein, provides elasticity and flexibility to tissues but is more commonly associated with skin and blood vessels than with hair. Chitin is a biopolymer found in the exoskeletons of arthropods and is unrelated to human hair composition. Therefore, among the options provided, keratin is the correct choice, as it directly relates to the composition and properties of hair.