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a
the atria are electrically isolated from the ventricles, connected only via the AV node which briefly delays the signal
b
gap junctions allow the entire myocardium of the atria to contract as a unit
c
atrioventricular valves prevent the passage of blood from the atria into the ventricles
d
autorhythmmic fibres are absent in the ventricles
answer is A.
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