What function do sebaceous glands perform?

Sebaceous glands play a crucial role in maintaining the health and integrity of the skin. They produce an oily substance known as sebum, which is secreted onto the surface of the skin. This sebum serves several important functions, including providing a protective barrier. It helps to retain moisture, preventing the skin from becoming dry and brittle. Additionally, the protective qualities of sebum help combat harmful bacteria and fungi, contributing to the overall health of the skin.

While sweating does help to regulate temperature and excrete toxins, that is primarily the function of sweat glands. Sebaceous glands do not generate heat, so the options related to sweat production, excretion of toxins, or heat generation do not apply to the primary role of sebaceous glands in skin protection.