Which structure is normally the primary pacemaker of the heart?

Which structure is normally the primary

Multiple choice — select the best answer

AThe sinoatrial (SA) node
BThe atrioventricular (AV) node
CThe bundle of His
DThe Purkinje fibers

✓ Correct answer: A. The sinoatrial (SA) node The SA node in the right atrium has the fastest intrinsic rate (about 60-100 beats per minute) and therefore sets the normal heart rhythm, called sinus rhythm.

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Topic: Cardiac Anatomy & Electrophysiology

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Which structure is normally the primary pacemaker of the heart?

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