<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>
<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>
which division of the and stimulates the secretion of hormones by the adrenal medulla
which division of the and stimulates the secretion of hormones by the adrenal medulla
sympathetic
sympathetic