in ventricular cells , the envelope of these tail currents obtained by varying the duration of the preceding depolarizations shows that ( a ) the tail currents are activated by pulses as short as 10 ms , and reach a maximum for pulse durations of 100-200 ms , ( b ) the rate of decay of the tail current gradually increases as the activating depolarizations are prolonged , and ( c ) the tails can not be due to deactivation of calcium currents , in agreement with other studies in frog heart .
C0018827
ventricular
C0018787
heart