Final answer:
The system responsible for regulating body temperature is the Integumentary System, which includes the skin. It works in conjunction with the sympathetic nervous system to monitor and initiate motor responses to maintain body temperature.
Step-by-step explanation:
The system responsible for regulating body temperature is the Integumentary System. The integumentary system, which includes the skin, helps to regulate body temperature through its association with the sympathetic nervous system. The sympathetic nervous system continuously monitors body temperature and initiates appropriate motor responses, such as sweating, to cool the body down when it becomes warm.