the cardiac and coronary vascular effects of t-1583 , a selective beta 1-adrenoceptor full agonist , and forskolin , a direct activator of adenylate cyclase , were compared in isolated , blood-perfused papillary muscle , sinoatrial node , and atrioventricular ( av ) node preparations of dogs .
C0018787
cardiac
C0004247
atrioventricular