Which of the following pacemaker cell populations has the fastest intrinsic rate of depolarization at about 60- 70 times or more per minute?

Question

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The sinoatrial (SA) node is the primary pacemaker of the heart and has the fastest intrinsic rate of depolarization at about 60-70 times or more per minute. The Purkinje fiber system and atrioventricular (AV) bundle are both specialized conduction pathways, but do not have pacemaker activity. The AV node has a slower intrinsic rate of depolarization at about 40-60 times per minute.

Which of the Following Pacemaker Cell Populations Has the Fastest