What is the pacemaker of the heart?

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Prepare for the NREMT AEMT Test. Study with flashcards and multiple-choice questions. Each question includes hints and explanations. Get ready for your exam now!

Multiple Choice

What is the pacemaker of the heart?

Explanation:
The heart’s natural pacemaker is the Sinoatrial node. Located in the right atrium near the opening of the superior vena cava, it fires electrical impulses at the fastest, most regular rate. This automaticity sets the pace for the entire heart and starts each heartbeat. From the SA node, the impulse travels to the atrioventricular node, then down the His-Purkinje system to coordinate ventricular contraction. Other parts of the conduction system can take over if the SA node fails, but they do so at slower rates, so they aren’t the normal source of pacing.

The heart’s natural pacemaker is the Sinoatrial node. Located in the right atrium near the opening of the superior vena cava, it fires electrical impulses at the fastest, most regular rate. This automaticity sets the pace for the entire heart and starts each heartbeat. From the SA node, the impulse travels to the atrioventricular node, then down the His-Purkinje system to coordinate ventricular contraction. Other parts of the conduction system can take over if the SA node fails, but they do so at slower rates, so they aren’t the normal source of pacing.

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