isolated segments of epicardial coronary artery with and without severe atherosclerotic lesions excised from human hearts 3 to 5 hours after sudden coronary death demonstrated spontaneous contractile activity that was dependent on the external calcium level and was inhibited by calcium antagonists and activation of beta-adrenoceptors ( isoproterenol and high concentrations of norepinephrine ) .
C0086418
human
C0001643
beta-adrenoceptors