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MCAT Question A Day - 7/3/13 - Answer!

Hormone production and release can be controlled by

A.  hormones from other glands.
B.  signals from motor neurons.
C.  the blood concentration of the substance that the hormone regulates.
D.  All of the above

The correct answer is (D). Hormones such as most of those from the anterior pituitary are produced in response to hypothalamic releasing hormones. Epinephrine and norepinephrine are released from the adrenal medulla in response to stimulation from sympathetic motor neurons. Hormones such as parathormone (parathyroid glands) and aldosterone (adrenal cortex) are regulated by negative feedback systems based on blood levels of calcium ions and sodium ions, respectively.