Impulse of heart beat originates from

SA node

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AV node

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Vagus nerve

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Cardiac nerve

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Solution

The correct option is A SA node
The sino-atrial node (SAN) can generate the maximum number of action potentials, i.e., 70-75 /min. It is responsible for initiating and maintaining the rhythmic contractile activity of the heart. Therefore, it is called as the natural cardiac pacemaker.

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