The pacemaker of heart is

Foramen ovale

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Sinoatrial node

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Ductus arteriosus

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Bundle of His

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Vagus nerve

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Solution

The correct option is B Sinoatrial node
Electrical impulses from the heart muscle cause your heart to beat (contract). This electrical signal begins in the sinoatrial (SA) node, located at the top of the heart's upper-right chamber (the right atrium). The SA node is sometimes called the heart's natural pacemaker.
So, the correct option is 'Sino-atrial node'.

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