Electrolysis Practice Exam

What is a primary function of the sebaceous glands?

1. Producing sweat

2. Regulating blood flow

3. Secreting oil to lubricate skin

4. Generating heat

The correct answer is: Secreting oil to lubricate skin

The primary function of the sebaceous glands is to secrete oil, also known as sebum, which lubricates the skin and hair. This oily substance plays a critical role in maintaining the skin's barrier function, preventing water loss, and providing hydration. The sebaceous glands are typically associated with hair follicles, and the sebum they produce helps to keep hair shiny and prevents it from becoming brittle. The other options involve different functions: sweat glands are responsible for producing perspiration to help regulate body temperature; blood flow is regulated by various mechanisms in the body, including the constriction and dilation of blood vessels, but not directly by sebaceous glands; and heat generation is primarily associated with metabolic activity and the muscles, particularly during exercise. Therefore, the secretion of oil by the sebaceous glands is essential for skin health, establishing the correct answer.