Final answer:
The integumentary system regulates body temperature by making sweat and dilating blood vessels near the skin surface to decrease body temperature.
Step-by-step explanation:
The integumentary system helps regulate body temperature through its association with the sympathetic nervous system. The body's internal thermostat is triggered when the temperature rises. The skin responds by making sweat and dilating blood vessels near the skin surface to help decrease body temperature. As the sweat evaporates from the skin surface, it takes the heat with it, cooling the body.