<P> Because the ANS , specifically the sympathetic division , exerts direct control over the chromaffin cells the hormone release can occur rather quickly . In response to stressors such as exercise or imminent danger , medullary cells release the catecholamines adrenaline and noradrenaline into the blood . Adrenaline composes about 85 % of the released catecholamines , and noradrenaline the other 15 % . </P>
when does the body secrete epinephrine and norepinephrine
In response to stressors such as exercise or imminent danger