The two body systems that work together to regulate body temperature are the nervous system and the endocrine system.
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The nervous system detects changes in body temperature through thermoreceptors and sends signals to the hypothalamus, which acts as the body's thermostat. When the body is too hot or too cold, the hypothalamus triggers responses to restore normal temperature.
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The endocrine system releases hormones that can influence metabolic rate and heat production. For example, thyroid hormones can increase metabolism and, consequently, heat production in the body.
Together, these systems help maintain homeostasis by regulating body temperature in response to various internal and external changes.