What is the main function of sweat glands?

The primary function of sweat glands is to regulate body temperature. When the body becomes overheated, sweat glands release perspiration, which consists mainly of water, onto the surface of the skin. As this sweat evaporates, it cools the body down, helping to maintain a stable internal temperature. This mechanism is crucial for thermoregulation, especially during physical exertion or in hot environments.

Other options do not pertain to the main function of sweat glands. Producing hair is the role of hair follicles, while providing nutrients to the skin relates more to blood vessels and sebaceous glands. Supporting fat storage is a function associated with adipose tissue and not sweat glands. Thus, the regulation of body temperature stands out as the primary and essential role performed by sweat glands.