Wisconsin Esthetics State Board Practice Test

Which of the following statements about sebum is true?

1. It primarily contributes to the formation of nails

2. It is a mixture that keeps skin supple

3. It can cause skin irritation

4. It is responsible for mechanical abrasion

The correct answer is: It is a mixture that keeps skin supple

Sebum is an oily substance produced by sebaceous glands in the skin. Its primary role is to keep the skin and hair moisturized and supple. By forming a barrier on the skin's surface, sebum also helps prevent water loss, contributing to hydration and maintaining skin elasticity. This protective layer aids in the overall health of the skin, making option B the correct statement regarding sebum. In contrast, the other statements do not accurately represent the role of sebum. While skin irritation can sometimes occur due to excess sebum or clogged pores, it is not a direct function of sebum itself. The formation of nails is not influenced by sebum; this process is related to keratin. Mechanical abrasion involves physical wear and tear on the skin rather than the biochemical properties of sebum. Thus, option B effectively summarizes the beneficial properties of sebum in skin care.