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Electrical Sinoatrial Node San Sets Rhythm Heartbeat Sending

The sinoatrial node (SAN) sets the heart's rhythm by generating electrical impulses that cause atrial contraction.

The sinoatrial node (SAN) initiates the heartbeat by generating electrical impulses that cause the atrial muscle to contract rhythmically.

Front Sinoatrial node (SAN)
Back Sets the rhythm of the heartbeat by sending out regular waves of electrical activity to the atrial wall
Generates electrical impulses that cause the cardiac muscle to contract

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