Which gland is part of the endocrine system and secretes hormones that regulate other glands?

• A. Adrenal gland
• B. Hypothalamus
• C. Pancreas
• D. Pituitary gland

Answer: (D)

The pituitary gland is the master regulator of the endocrine system, releasing hormones that control other endocrine glands. Its anterior lobe makes hormones like thyroid-stimulating hormone to drive the thyroid, adrenocorticotropic hormone to stimulate the adrenal cortex, and FSH and LH to regulate the gonads, along with prolactin for milk production. The posterior pituitary releases hormones (such as ADH and oxytocin) produced in the hypothalamus, helping coordinate broader bodily responses. This direct role in signaling other glands to release their hormones is what makes the pituitary the best answer. While the hypothalamus influences the pituitary and other glands produce important hormones, the pituitary’s actions specifically center on regulating other endocrine glands.