Final answer:
The hypothalamus secretes hormones controlling the pituitary gland, which acts as the master gland of the endocrine system, regulating glands such as the thyroid, adrenal, and gonads.
Explanation:
The hypothalamus is the main brain structure that secretes hormones controlling the pituitary gland. The pituitary gland is considered the master gland of the endocrine system, influencing other glands like the thyroid gland, adrenal glands, and gonads.
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