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.

The endocrine system involves chemical signalling via the secretion of molecules called hormones into extracellular fluid. The brain, or control center functions to receive and process the information from the receptor. Effectors receive the control center's command and elicits a response in the form of a feedback loop, that may oppose or enhance the stimulus.

Cells in a multicellular organism become specialized for particular tasks and communicate with one another in order to maintain homeostasis. Within the human body these are known as hormone cascades, where several complex steps occur- the tissues signal to one another with the use of hormones released by the endocrine system. The regulation (increase and decrease) of these secretions is achieved by negative feedback loops, where the release of certain substances during a cascade in turn halts the secretion of hormones at earlier stages.

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