What is the primary role of sebaceous glands?

Sebaceous glands play a crucial role in maintaining the health and function of the skin by producing an oily substance known as sebum. This sebum is secreted onto the skin's surface, and its primary function is to help keep the skin moisturized. By coating the skin with this oil, sebaceous glands prevent dryness and provide a barrier that protects the skin against external environmental factors, such as bacteria and pollutants.

Additionally, sebum contributes to the lipid barrier of the skin, which is vital for retaining moisture and enhancing skin elasticity. This helps to maintain a healthy appearance and supports overall skin health. While sebaceous glands may have other minor roles, their primary function is indeed related to oil production and skin hydration.

The other choices focus on functions that are typically associated with different structures or mechanisms within the skin, like sweat glands for regulating temperature and UV protection provided by melanin in skin cells. Wound healing involves a different set of physiological processes and is not primarily the function of sebaceous glands.