Which three layers make up the structure of human hair?

The correct answer identifies the three primary layers of human hair: the cortex, cuticle, and medulla.

The cuticle is the outermost layer, composed of overlapping, scale-like cells that protect the inner layers from damage and environmental factors. This layer plays a crucial role in the overall appearance and health of hair, influencing shine and smoothness.

The cortex is the thickest layer, located beneath the cuticle. It is primarily made up of long, fibrous proteins and is responsible for the hair's strength, elasticity, and color. The cortex contains the melanin pigments that give hair its natural shade.

The medulla is the innermost layer of the hair shaft. While it may not be present in all hair types, when it is, it consists of a soft, spongy material that may serve to provide some structural support. Its presence can vary widely depending on the person.

Together, these three layers—cuticle, cortex, and medulla—are essential for understanding hair structure and function, making the identification of these components crucial for those studying cosmetology. The other options incorrectly include components that do not constitute the hair's structural layers, such as the base or the root, which are not layers of the hair