What are tropic hormones?
Tropic hormones are hormones that act on endocrine glands, usually inducing them to secrete other hormones. They are produced by the hypothalamus and anterior pituitary gland.
The hypothalamus secretes tropic hormones which act on the anterior pituitary gland, causing it to secrete its own tropic hormones.
An example is the hormone thyrotropin releasing hormone (TRH) secreted by the hypothalamus, which stimulates the anterior pituitary gland to release thyroid stimulating hormone (TSH), which stimulates the thyroid gland to secrete the hormone thyroxin.