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During a Single Heartbeat,first the ____________ Contracts,and Then the _____________

Question 33

Multiple Choice

During a single heartbeat,first the ____________ contracts,and then the _____________ contracts.


A) SA node;AV node
B) Ventricles;atria
C) AV node;SA node
D) SA node;ventricles
E) Atria;ventricles

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