Which structure in the skin helps regulate body temperature through sweat production?

The structure in the skin that helps regulate body temperature through sweat production is the sweat glands. These glands, also known as sudoriferous glands, are crucial for thermoregulation. When the body's temperature rises, the sweat glands produce sweat, which is primarily composed of water and electrolytes. As sweat evaporates from the skin surface, it cools the body down, effectively reducing the overall temperature.

In contrast, sebaceous glands are responsible for producing sebum, an oily substance that lubricates and waterproofs the skin, but they do not play a direct role in temperature regulation. Keratinocytes are the predominant cell type in the epidermis that produce keratin, providing structural strength and protection to the skin, but they do not contribute to thermoregulation. Melanocytes are responsible for producing melanin, the pigment that gives skin its color and protects against UV radiation, but they do not have a role in sweat production or temperature control.

Thus, sweat glands are the key players in temperature regulation through the mechanism of sweating, making them the correct choice.