norepinephrine noradrenaline, norepi hormone and neurotransmitter molecule. skeletal formula.

norepinephrine noradrenaline norepi hormone neurotransmitter molecule skeletal formula ne norepinephrin norad phenethylamine catecholamine hypotension vascular tone smooth muscle adrenergic receptor noradrenergic sympathetic nervous system stress fight flight response atoms atomic molecular compound composition chemical chemistry structure line drawing flat icon