Which of the Following Statements About Membrane Potentials in Different

question 55

Multiple Choice

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

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