During the rhythmicity of heart beat, the impulse of cardiac begins at _________.

A.V. Node

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S.A. Node

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Bundle of His

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Purkinje fibres

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Solution

The correct option is B S.A. Node
The heartbeat happens as follows: The SA node (called the pacemaker of the heart) sends out an electrical impulse. The upper heart chambers (atria) contract. The AV node sends an impulse into the ventricles.
So, the correct answer is (B)

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