Which component of the heart's conduction system is described as firing at 40-60 BPM?

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Prepare for the NREMT Advanced-EMT Test. Use flashcards and multiple choice questions, complete with hints and explanations. Ready yourself for success on your exam!

Multiple Choice

Which component of the heart's conduction system is described as firing at 40-60 BPM?

Explanation:
The heart’s pacemaking hierarchy shows where those automatic rhythms come from. The SA node is the primary pacemaker, firing about 60–100 beats per minute. When the SA node isn’t driving, the AV node can take over, and it has a slower intrinsic rhythm of roughly 40–60 beats per minute. The bundle of His and Purkinje fibers are mainly conduction pathways, with the Purkinje system capable of pacing at about 20–40 beats per minute if both the SA and AV nodes fail, but they are not typical primary pacemakers. So, the component that fires at about 40–60 BPM is the AV node.

The heart’s pacemaking hierarchy shows where those automatic rhythms come from. The SA node is the primary pacemaker, firing about 60–100 beats per minute. When the SA node isn’t driving, the AV node can take over, and it has a slower intrinsic rhythm of roughly 40–60 beats per minute. The bundle of His and Purkinje fibers are mainly conduction pathways, with the Purkinje system capable of pacing at about 20–40 beats per minute if both the SA and AV nodes fail, but they are not typical primary pacemakers. So, the component that fires at about 40–60 BPM is the AV node.

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