chronotropic responses to sympathomimetic amines of isolated atrial preparations from toads ( bufo marinus ) were mediated by beta-adrenoceptors since isoprenaline was more potent than adrenaline and noradrenaline , and propranolol was a potent antagonist ( pa2 , adrenaline as agonist = 9.33 ) .
C0028351
noradrenaline
C0014563
adrenaline