Ontario Hairstyling Practice Exam

Sebum serves a critical function in skin care by acting as a natural moisturizer. It is an oily substance produced by sebaceous glands that helps to keep the skin hydrated and maintain its elasticity. Sebum creates a barrier on the surface of the skin, which prevents excessive moisture loss and keeps the skin soft and supple. This natural oil also helps to balance skin conditions by preventing excessive drying or oiliness.

The other options address important aspects of skin health but do not pertain specifically to the role of sebum. Color in the skin is largely influenced by melanin, which is produced by melanocytes. Protection from UV rays is mainly achieved through the use of sunscreen, as well as through certain skin pigmentation that provides a protective effect. The removal of dead skin cells is typically managed through exfoliation, either mechanically or chemically, rather than by the action of sebum. Thus, the primary function of sebum as a moisturizer underscores its vital role in maintaining healthy skin.