New Jersey Esthetics Practice Exam 2026 – Complete Test Prep

The main function of sebaceous glands is to excrete sebum, which is a natural oil that helps to keep the skin lubricated and protected. Sebum serves several important purposes: it prevents water loss from the skin, acts as a barrier against some bacteria, and enhances the overall texture of the skin. This oil production is particularly significant in maintaining the skin's hydration and preventing it from becoming dry and brittle.

Other options, while related to skin function, do not pertain to the specific role of sebaceous glands. Hydration of the skin is primarily managed through other mechanisms, such as the presence of natural moisturizing factors within the skin. The production of sweat is primarily the responsibility of sweat glands, while temperature regulation relies on a combination of sweat production and blood flow to the skin rather than the action of sebaceous glands. Thus, the statement regarding the secretion of sebum accurately captures the primary function of these glands.