What is the primary function of sebaceous glands?

The primary function of sebaceous glands is to produce sebum, which is an oily substance that helps to lubricate and protect the skin and hair. Sebum plays a crucial role in maintaining the skin's barrier function, preventing dryness, and providing a certain level of waterproofing. It also has antimicrobial properties, which can help protect the skin from certain bacteria and fungi.

Sebaceous glands are associated with hair follicles and secrete sebum directly into the follicle, which then spreads to the surface of the skin. This oil plays a pivotal role in keeping the skin moisturized and healthy, making it essential for overall skin health.

The other options, while related to skin and hair physiology, do not accurately describe the primary function of sebaceous glands. Sweat is excreted by sweat glands rather than sebaceous glands. Thermoregulation is primarily managed by sweat glands and blood vessels, while hair growth is influenced more by hair follicles and hormones than by sebaceous glands themselves.