The Action Potential of a Myocardial Pacemaker Cell Differs from That

The action potential of a myocardial pacemaker cell differs from that of the non-pacemaker cell in that:

A) The resting membrane potential is more negative in the pacemaker cells.
B) The depolarization is faster in the pacemaker cell.
C) Ca⁺⁺ channels do not play a significant role in the pacemaker cell action potentials.
D) Potassium channels conductance is primary for initiation of the action potential in pacemaker cells.
E) The pacemaker cell action potential depolarization is initiated by the influx of calcium.