Final answer:
The hypothalamus is the part of the brain that controls the autonomic nervous system (ANS) and plays a major role in homeostasis.
Step-by-step explanation:
The hypothalamus is the part of the brain that plays a major role in controlling the autonomic nervous system (ANS). It is located in the forebrain and serves as the master control center for homeostasis through the autonomic and endocrine systems. The hypothalamus regulates both autonomic function and endocrine function, and coordinates sympathetic and parasympathetic efferent pathways to regulate the activities of the organ systems of the body.