mainly by feedback mechanism
They are called tropic hormones.They stimulates secretion of other hormones.
I don't know the name of the hormone but I do know that it signals other glands to produce growth hormones.
hormones
Growth Hormones, Thyroid Hormones, Sex Hormones and Mechanical Stress
The reproductive cycle of a human is usually regulated by hormones.
oxytocin
hormones
The neuroendocrine "letdown" reflex is regulated by oxytocin.
It is regulated by hormones, but its job is not to release them. The endocrine system releases hormones. The urinary system expels waste from the body.
If you have an inactive thyroid, than usually they will regulate it with a medication called synthroid. People who have there thyroid removed also have it regulated with a medication called synthroid.
Hormones
oxytocin