Milady Cosmetology Practice Exam

What structure is primarily affected by sebaceous gland activity?

1. Hair Follicle

2. Hair Shaft

3. Network of Blood Vessels

4. Outer Epidermis

The correct answer is: Hair Follicle

The primary structure affected by sebaceous gland activity is the hair follicle. Sebaceous glands are responsible for producing sebum, an oily substance that moisturizes and protects the skin and hair. This sebum is released into the hair follicle, where it travels along the hair shaft to the surface of the skin. By doing this, sebaceous glands help to keep the hair and scalp hydrated, which reduces dryness and brittleness. The hair follicle itself serves as the anchoring point for the hair, and the health of the follicle can greatly influence hair growth and quality. As sebum is secreted into the hair follicle, it also plays a role in maintaining the skin’s barrier function, thereby impacting overall skin and hair health. While the hair shaft can be influenced by the presence of sebum, the direct activity originates from the sebaceous glands interacting with the hair follicles. The network of blood vessels and the outer epidermis are not primarily influenced by the secretion of sebum in the same way, making the hair follicle the correct choice.