what is SAN in the heart . explain.
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Two groups of pacemaker cells coordinate the contractions of the heart muscles: impulses from the SAN (sino-atrial node) cause the atria to contract, and stimulate the AVN. impulses from the AVN (atrio-ventricular node) cause the ventricles to contract
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SAN is known as (sino artial node) cause the artia to contract and simulate AVN
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