The Adrenal Medulla and Fight or Flight. Other sympathetic neurons stimulate the adrenal medulla to release noradrenaline and adrenaline into the bloodstream. The hormones then travel around the body in the blood. They trigger fight or flight reactions after binding to adrenergic receptors on target cells. Acceleration of metabolism.Increase in blood sugar levels.Increase in heart rate as well as vasoconstriction(see the last point)..Activation of RAS system, thus lead to arousal,anxiety and coarse tremors of extremities.Relaxation of the wall of GIT. and contraction of sphincters, so net result is constipation.Piloerection.(goosebumps).Increases blood supply to muscle.Dilation of pupil and relaxation of ciliary muscles.Bronchodilation, increase in rate and force of respiration.Increases RBC count by contraction of spleen.Increases plasma protein concentration by movement of fluid out of circulation.On cardiovascular system: Increase in heart rate, cardiac output,systolic blood pressure. Decrease in peripheral resistance,diastolic blood pressure,mean arterial blood pressure.

Is it Corticoids?

Corticoid hormones balance stress response, energy flow, body temperature, water balance, and other essential processes. Two groups, the glucocorticoids and the mineralocorticoids, chemically control some of the most basic actions necessary to protect, nourish, and maintain the body. The gender-neutral corticoids guide these life-sustaining functions in both males and females.