Stressful stimuli cause the hypothalamus to activate the adrenal medulla via nerve impulses
(a) andthe adrenal cortex via hormonal signals
(b). The adrenal medulla mediates short-term responses tostress by secreting the catecholamine hormones epinephrine and norepinephrine. The adrenal cortexcontrols more prolonged responses by secreting corticosteroid.