The β receptors respond to much lower concentrations of epinephrine or norepinephrine than the α receptors. Ahlquist in 1948 classified the adrenergic receptors as α or β, based on their response to epinephrine, norepinephrine, and isoproterenol, an adrenergic agonist. For this reason, receptors for both epinephrine and norepinephrine are called adrenergic receptors. ![]() Epinephrine is also called adrenaline, derived from the name of its gland. ![]() The word epinephrine derives from epi, meaning above, and nephros, the root word for kidney, because the gland sits atop the kidney. ![]() Epinephrine is a hormone released from the adrenal medulla in response to stress, mediated by sympathetic fibers.
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