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Atria and ventricles do not contract simultaneously; ventricles contract only after atrial systole. This occurs because

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the atria are electrically isolated from the ventricles, connected only via the AV node which briefly delays the signal

gap junctions allow the entire myocardium of the atria to contract as a unit

atrioventricular valves prevent the passage of blood from the atria into the ventricles

autorhythmmic fibres are absent in the ventricles

answer is A.

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