The hormone you are looking for is called a tropic hormone.

Here's why:

* Tropic hormones are hormones produced by one endocrine gland that stimulate another endocrine gland to produce and release its own hormones.

* They act like messengers, telling other glands to get to work.

Example:

* The pituitary gland releases thyroid-stimulating hormone (TSH), which travels to the thyroid gland and stimulates it to produce thyroid hormones (T3 and T4).

Let me know if you have any other questions!