Which gland releases hormones that regulate other endocrine glands?

• A. Pancreas
• B. Pineal Gland
• C. Pituitary Gland
• D. Thyroid Gland

Answer: (C)

Releasing hormones that regulate other glands hinges on tropic signals that instruct the endocrine axis to activate downstream glands. The gland at the top of this regulation is the pituitary, especially its anterior portion, which sends out several tropic hormones such as TSH, ACTH, FSH, and LH. TSH tells the thyroid to produce thyroid hormones; ACTH triggers the adrenal cortex to release cortisol; FSH and LH drive the gonads to make sex hormones. Those final hormones then feed back to keep the system balanced. This master-regulator role is what makes the pituitary the gland whose hormones coordinate other endocrine glands.

The other options don’t fit this role as clearly. The pancreas mainly controls blood sugar through insulin and glucagon. The pineal gland produces melatonin affecting sleep-wake cycles. The thyroid gland releases thyroid hormones that regulate metabolism but do not primarily regulate other endocrine glands.