Endogenous catechol amines -norepinephr ine 【Pharmacological properties】 a1=a2;B1>>B2 香 Blood pressure: 图 Heart:(weak) B0》 《I一《g一2 》Endogenous catecholamines -- norepinephrine 【Pharmacological properties】 α1 =α2; β1 > >β2 Blood pressure: Heart: (weak)