What type of gland secretes sebum?

• A. Sweat glands
• B. Sebaceous glands
• C. Apocrine glands
• D. Endocrine glands

Answer: (B)

Sebaceous glands are specialized exocrine glands located in the skin that are responsible for the secretion of sebum, an oily substance. Sebum plays a critical role in maintaining skin hydration and protecting the skin from environmental factors by forming a barrier that helps to prevent water loss. It also has antimicrobial properties that protect against certain pathogens.

Each type of gland has its specific function. For example, sweat glands are involved in thermoregulation through the secretion of sweat, while apocrine glands are primarily responsible for the production of pheromones and are often associated with hair follicles in specific areas of the body. Endocrine glands, on the other hand, release hormones directly into the bloodstream, which is different from the localized secretion that occurs in sebaceous glands.

Thus, the unique role of sebaceous glands in producing sebum makes them the correct answer to the question.