<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>
when does the body secrete epinephrine and norepinephrine
when does the body secrete epinephrine and norepinephrine
In response to stressors such as exercise or imminent danger
In response to stressors such as exercise or imminent danger