What is the normal intrinsic rate of the AV node?

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Multiple Choice

What is the normal intrinsic rate of the AV node?

Explanation:
Intrinsic rate refers to the spontaneous firing rate of a pacemaker tissue when it isn’t driven by higher-order control. The AV node has automaticity, but its cells depolarize more slowly than the SA node, giving it an intrinsic rate around 40-60 beats per minute. This slower pace suits its role as a secondary pacemaker and as the gatekeeper that delays conduction from atria to ventricles. If the primary pacemaker fails, the AV node can take over at this 40-60 bpm range. By contrast, the SA node typically paces at 60-100 bpm, and ventricular pacemaker tissue around 20-40 bpm. So the normal intrinsic rate of the AV node is 40-60 bpm.

Intrinsic rate refers to the spontaneous firing rate of a pacemaker tissue when it isn’t driven by higher-order control. The AV node has automaticity, but its cells depolarize more slowly than the SA node, giving it an intrinsic rate around 40-60 beats per minute. This slower pace suits its role as a secondary pacemaker and as the gatekeeper that delays conduction from atria to ventricles. If the primary pacemaker fails, the AV node can take over at this 40-60 bpm range. By contrast, the SA node typically paces at 60-100 bpm, and ventricular pacemaker tissue around 20-40 bpm. So the normal intrinsic rate of the AV node is 40-60 bpm.

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