Final answer:
GH secretion is stimulated by growth hormone-releasing hormone (GHRH) from the hypothalamus, low blood glucose, deep sleep, and exercise. It is inhibited by growth hormone-inhibiting hormone (GHIH or somatostatin), high blood glucose, free fatty acids, and negative feedback from GH and IGFs.
Step-by-step explanation:
The types of stimuli that stimulate GH secretion include hormonal stimuli, specifically growth hormone-releasing hormone (GHRH). GHRH is a hormone released by the hypothalamus that triggers the release of GH from the anterior pituitary gland. Other factors that can stimulate GH release include low blood glucose levels, deep sleep, and exercise.
Conversely, the primary stimulus that inhibits GH secretion is growth hormone-inhibiting hormone (GHIH), also known as somatostatin. GHIH is produced by the hypothalamus and inhibits growth hormone production in the anterior pituitary. High levels of glucose and free fatty acids in the blood can also signal the release of GHIH, reducing GH secretion. Additionally, high levels of circulating GH and insulin-like growth factors (IGFs) provide a negative feedback signal to decrease the secretion of GH.