Adrenal medulla secretes, two hormones adrenaline (epinephrine) and non-adrenaline (non-epinephrine) in an approximate ratio of $4$ to $1$ , respectively.
Adrenaline is called emergency hormone because it releases on the time of fear, cold, fight, emotional states, danger, pain-lack of $O _{2}$ and blood loss etc. and increases the blood pressure, heart beats, tightening of the stomach, dry mouth, trembling muscles, general feeling of anxiety and increased awareness that attends sudden fright or other strong emotional states.