What is the function of the hair cortex?

The function of the hair cortex primarily involves providing strength and elasticity to the hair. The cortex is the thickest layer of the hair shaft and is located beneath the cuticle, which is the outer protective layer. It contains fibrous proteins, including keratin, which are crucial for the structural integrity of the hair. This layer also plays a key role in the hair's flexibility and resilience, enabling it to withstand environmental stressors and physical manipulation, such as styling or brushing.

While the cortex also contributes to the overall texture and stability of the hair, its main responsibility centers around maintaining the internal strength and elasticity. This characteristic is especially important because it allows hair to endure the constant tension and movement that occurs in everyday activities. Other parts of the hair, like the medulla, are less understood in terms of function, and the cuticle primarily serves a protective role.

The other options do have some relevance to hair structure but do not accurately describe the primary function of the cortex. For instance, while the cortex does play a role in the hair's color due to the distribution of melanin pigments, it is not its main function. Determining hair shape is more directly related to the arrangement of the cortex and the medulla, while the cuticle is