In human beings heart beat is initiated by

Purkinje fibres

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AV node

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SA node

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Bundles

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Solution

The correct option is C SA node
Sinoatrial node is a cluster of cells present in the right atria just below the opening of Vena cava. It autonomously generates electrical impulses that initiate the muscle contraction in the atria.
It is called the natural pacemaker of the heart.
So, the correct answer is 'SA node'.

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