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...ute of signaling increases the rate of noradrenergic activity in the locus ceruleus, and the [[person]] becomes alert and [[attentive]] to the [[environment]]. ...eived as a threat, a more [[intense]] and prolonged discharge of the locus ceruleus activates the sympathetic division of the [https://en.wikipedia.org/wiki/Au

The [[locus ceruleus]] and other noradrenergic cell groups of the [[adrenal medulla]] and pons,