Final answer:
Growth hormone is under the dual control of growth hormone-releasing hormone (GHRH) and growth hormone-inhibiting hormone (GHIH).
Step-by-step explanation:
Growth hormone (GH) levels are regulated by two hormones produced by the hypothalamus: growth hormone-releasing hormone (GHRH) and growth hormone-inhibiting hormone (GHIH), also known as somatostatin.
GHRH stimulates the release of GH from the anterior pituitary gland, while GHIH inhibits its release. These two hormones work together to control the secretion of growth hormone in the body.