_IMG_45_13StressShort.jpg Catecholamines from the adrenal medulla. The adrenal medulla mediates short-term responses to stress by secreting epinephrine (adrenaline) and norepinephrine (noradrenaline). These hormones enable a rapid ( _MED_Fight-or-flight.jpg fight-or-flight ) responses by increasing blood glucose levels and blood pressure and directing blood to the heart, brain, and skeletal muscles.