South Carolina Cosmetology Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The structure of a hair follicle is primarily composed of keratin, which is a fibrous protein that forms the fundamental building block of hair, as well as nails and the outer layer of skin. Keratin provides strength and resilience, allowing hair to withstand various physical stresses.

Within the hair follicle, keratinocytes are the predominant cells that generate keratin. These cells undergo a process of keratinization, during which they produce keratin as they move upwards through the follicle, eventually forming the hair shaft. This process is essential for hair growth and the overall health of the hair.

Collagen, while important for the structural integrity of skin and providing support, is not the primary component of hair itself. Melanin is responsible for hair color but does not contribute to the structural composition of the follicle. Elastic fibers play a role in the elasticity of the skin and overall hair structure, but again, they are not the primary component that defines the hair follicle.