Which of the following statements about membrane potentials in different types of cardiac muscle cells is correct?
A) Myocardial cells have a resting membrane potential of about -90 mV; pacemaker cells do not have a true resting membrane potential
B) Once threshold depolarization is reached in both myocardial and pacemaker cells, the rapid upswing of the action potential is caused by the opening of voltage-gated sodium channels
C) Voltage-gated calcium channels are opened at some time during the action potential in both myocardial and pacemaker cells
D) Both myocardial cells have a resting membrane potential of about -90 mV; pacemaker cells do not have a true resting membrane potential and once threshold depolarization is reached in both myocardial and pacemaker cells, the rapid upswing of the action potential is caused by the opening of voltage-gated sodium channels are correct
E) Both myocardial cells have a resting membrane potential of about -90 mV; pacemaker cells do not have a true resting membrane potential and voltage-gated calcium channels are opened at some time during the action potential in both myocardial and pacemaker cells are correct
Correct Answer:
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