Scientists once thought that the pituitary gland was the regulatory center of the endocrine system. they now think that a structure in the brain, the hypothalamus, acts as this regulatory center. which of the following does not provide information supporting this new conclusion? the hypothalamus can send nerve signals to other parts of the brain. the hypothalamus produces and secretes hormones. hormones produced by the hypothalamus stimulate or inhibit the release of other hormones by the pituitary gland. blood vessels that connect the hypothalamus with the pituitary gland have been found.