Conducting system of the heart

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Last updated 5:25 AM on 4/9/26

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1

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what is the first step

Sinoatrial (SA) node starts the heartbeat (pacemaker)

2

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2nd step

AV node slows the electrical impulse, allowing the atria to contract fully

3

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3rd step

The atrioventricular bundle conducts the muscle impulse into the interventricular septum

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4th step

The left and right bundle branches carry the signal toward the apex of the heart

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5th step

Purkinje fibers trigger ventricular contraction