A student nurse overhears a physician explain the cardiac conduction system to a patient. Where does the heart's electrical impulse originate?

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Multiple choice — select the best answer

ASinoatrial node
BAtrioventricular node
CLeft atrium
DRight atrium

✓ Correct answer: A. Sinoatrial node The electrical impulse originates in the sinoatrial (SA) node, the natural pacemaker of the heart, which coordinates normal sinus rhythm. The SA node is located near the opening of the superior vena cava in the right atrium.

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A student nurse overhears a physician explain the cardiac conduction system to a patient. Where does the heart's electrical impulse originate?

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