What signals the adrenal glands to produce more of the hormones adrenaline and cortisol and release them into the bloodstream?

Answer and Explanation:

The hypothalamus, i.e., the nerve center produces corticotropin-discharging hormone (CRH) that invigorates the pituitary organ to emit adrenocorticotropin hormone (ACTH).  ACTH at that point invigorates the adrenal organs to make and discharge cortisol hormones into the blood.  The sympathetic sensory system conveys driving forces to organs and smooth muscles and advises the adrenal medulla to discharge epinephrine (adrenaline) and norepinephrine (noradrenaline) into the circulation system. These "stress hormones" results in a few variations in the body, incorporating an expansion in pulse and circulatory strain.