Which of the following statements is false?
A. The rapid depolarization phase of the
action potential in pacemaker cells results
from the influx of sodium through voltagegated
sodium channels.
B. The repolarization of the pacemaker cells
following an action potential allows for the
heart to relax between contractions.
C. The resting membrane potential of cardiac
pacemaker cells gradually becomes less
negative on its own.
D. Pacemaker cells repolarize by opening
voltage-gated potassium channels.
E. None of the answer options is false.
A
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