the results show that the myocardial alpha 1-adrenoceptor stimulation ( 1 ) increases the contractile force of the guinea-pig ventricular papillary muscle , ( 2 ) prolongs the time to peak contractile force while the duration of relaxation is not altered , ( 3 ) prolongs the fast response action potential duration , and ( 4 ) increases the maximal rate of depolarization during the phase 0 of the slow response action potential .
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myocardial
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of