Final answer:
The hypothalamus is the key brain structure that maintains homeostasis by regulating various bodily functions.
Explanation:
The hypothalamus is the integrating center within the brain responsible for maintaining homeostasis. It regulates various functions such as temperature, hunger, thirst, sleep cycles, and stress responses through the autonomic and endocrine systems. The hypothalamus is a vital control center that plays a crucial role in ensuring the body's internal environment remains stable.
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