What is a pacemaker?

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(D) The contraction of the atria is initiated and activated by the sinoatrial node ($SA$ node),which is commonly known as the pacemaker.It is located

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Sino-atrial node that provides impulse for heart beat

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(D) The contraction of the atria is initiated and activated by the sinoatrial node ($SA$ node),which is commonly known as the pacemaker.It is located in the right atrium and generates electrical impulses at regular intervals.These impulses spread across the walls of the atria via muscle fibres,causing them to contract and force blood into the respective ventricles.

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