Which of the following cardiac cells has the slowest action potential?
a. Atrial c. Purkinje fiber
b. Ventricular d. Sinoatrial node
ANS: D
The slope of phase 0 of the sinoatrial node (pacemaker) is less than those of the atrial, ventricular, and Purkinje fiber action potentials, and the former often is referred to as a slow action potential, whereas the latter are called fast action potentials.
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