why is the hypothalamus the master control centre of the endocrine system?

Answer 1

The hypothalamus links the nervous system to the endocrine system via the pituitary gland, also known as the "master gland," by synthesizing and secreting neurohormones, often called releasing hormones, as needed that control the secretion of hormones from the anterior pituitary gland — among them, gonadotropin-releasing hormone (GnRH). The neurons that secrete GnRH are linked to the limbic system, which is primarily involved in the control of emotions and sexual activity. The hypothalamus also controls body temperature, hunger, thirst, and circadian cycles.