which division of the and stimulates the secretion of hormones by the adrenal medulla
Adrenal medulla 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%.[2]
Epinephrine Epinephrine, also known as adrenalin or adrenaline, is a hormone, neurotransmitter, and medication.[3][4] Epinephrine is normally produced by both the adrenal glands and certain neurons.[3] It plays an important role in the fight-or-flight response by increasing blood flow to muscles, output of the heart, pupil dilation, and blood sugar.[5][6] It does this by binding to alpha and beta receptors.[6] It is found in many animals and some single cell organisms.[7][8] Napoleon Cybulski first isolated epinephrine in 1895.[9]