The natural pacemaker of heart is-

SA node or Sino-Artrial Node

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AV Node

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Helpful in Initiation of cardiac impulse

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Both a and c are correct

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Solution

The correct option is D Both a and c are correct
The sinoatrial node (SA node) is a specialized myocardial structure that initiates the electrical impulses to stimulate contraction of upper heart chambers (atria). The signal then passes through the AV (atrioventricular) node to the lower heart chambers (ventricles), causing them to contract, or pump.

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