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In page Sympathoadrenal system:
"The two main chemical messengers of the sympathoadrenal system are norepinephrine and epinephrine (also called noradrenaline and adrenaline respectively). These chemicals are created by the adrenal glands after receiving neuronal signals from the sympathetic nervous system. The different physiological effects of these chemicals depend on the particular tissue that it innervates. As part of the sympathoadrenal system, these chemicals act rapidly and dispel quickly as opposed to the longer-lasting effect of hormones.[citation needed]
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