Which hormone is secreted by the pituitary to stimulate the thyroid?

Thyroid Stimulating Hormone (TSH) is specifically released by the anterior pituitary gland and plays a vital role in regulating the function of the thyroid gland. It stimulates the thyroid to produce and release thyroid hormones, which are essential for controlling metabolism, growth, and energy regulation in the body. When TSH binds to receptors on the thyroid gland, it triggers the synthesis and secretion of the thyroid hormones T3 (triiodothyronine) and T4 (thyroxine).

The other hormones mentioned do not directly influence the thyroid. Adrenocorticotropic hormone (ACTH) primarily stimulates cortisol secretion from the adrenal glands, Luteinizing Hormone (LH) is involved in regulating reproductive processes and stimulating ovulation, while Growth Hormone (GH) is crucial for growth, cell repair, and metabolism. Therefore, TSH’s specific role in thyroid stimulation makes it the correct answer.