Natural pacemaker of the heart

this image shows the natural passage of the nerve impulses in the cardiac muscle.This image shows the natural pacemaker of the heart (SA node)"sinoatrial node" that sinus has its own rhythmic discharge of impulses.that means that the heart is capable of beating alone even after being separated from the supplying nerves.

1. Sino-atrial node
2. AV node "Atrio-ventricular node)

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