![]() What is secreted by preganglionic sympathetic fibers? Preganglionic sympathetic axons terminate in the adrenal medulla and stimulate the release of epinephrine and norepinephrine. ![]() What stimulates the adrenal medulla to secrete excitatory hormones? Terms in this set (21) The adrenal medulla secretes epinephrine during sympathetic stimulation. ![]() What is the main chemical released by the adrenal medulla in response to sympathetic stimulation quizlet? Physiologic Effects of Medullary Hormones In general, circulating epinephrine and norepinephrine released from the adrenal medulla have the same effects on target organs as direct stimulation by sympathetic nerves, although their effect is longer lasting.
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