adrenaline chemical structure diagram – epinephrine neurotransmitter and hormone

text sketch presentation pattern number logo line font drawing document diagram design circle cartoon brand adrenaline epinephrine neurotransmitter hormone molecule structure chemistry catecholamine organic compound brain nervous system medical science biology pharmacology synthesis reaction stress response fight flight anxiety metabolism stimulant cognitive function receptors physiology biochemistry medicine clinical research hydroxyl adrenergic energy focus attention alertness heart blood circulation emergency mood