Artificial pacemaker is usually implanted to correct the defect in

AV node

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SA node

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Purkinje fibres

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Mitral valve.

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Solution

The correct option is A SA node
The sinoatrial (SA) node or sinus node is the heart's natural pacemaker. It produces the electrical impulses that cause your heart to beat. When it stops working correctly an artificial pacemaker is usually implanted.
So, the correct option is B.

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