Hormones of adrenal medulla, i.e., adrenaline and noradrenaline (belongs to the category of compounds called catecholamines) are secreted in response to any kind of stress, danger and during emergency situations like fall in blood pressure or sugar, increase respiratory rate and heart beat. CNS at the time of stress or danger stimulates adrenal medulla to release these hormones. All these condition need more energy for their action. Thus, because these hormones prepares the body to face stress or danger hence, are called emergency hormones.