determination of pa2 values of propranolol and metoprolol using isoproterenol and norepinephrine as agonists and analysis of the slopes of schild plots suggested that in atria isolated from control rats the chronotropic effect of isoproterenol and norepinephrine resulted from the preferential interaction of the catecholamines with a homogeneous beta-1 adrenoceptor population .
C0022245
isoproterenol
C0007412
catecholamines