1. Pacemaker is the region in tile heart which initiates the beating. 2. The natural pacemaker of the heart is sinoatrial node (SA node). 3. The pacemaker is autorhythmic, it is able to repeatedly and rhythmically generate impulses. 4. SA node is responsible for initiation of cardiac excitation. Therefore, it is called a pacemaker.

Peacemaker.

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Peacemaker.

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Pacemaker is the region in tile heart which initiates the beating.
The natural pacemaker of the heart is sinoatrial node (SA node).
The pacemaker is autorhythmic, it is able to repeatedly and rhythmically generate impulses.
SA node is responsible for initiation of cardiac excitation. Therefore, it is called a pacemaker.

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