Which of the following statements concerning action potentials in the heart is correct?
a. The rising phase of the action potential in cardiac autorhythmic cells is due to a rapid Ca2+ influx.
b. The rising phase of the action potential in cardiac contractile cells is due to a rapid Na+ influx.
c. The plateau phase of the action potential in cardiac contractile cells is due to a slow Ca2+ influx.
d. Two of these answers are correct.
e. All of these answers are correct.
E
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