The Action Potential of a Myocardial Pacemaker Cell Differs from That

question 1

Multiple Choice

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.

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