The correct sequence for the conducting system is:
a. sinoatrial node, AV bundle, Purkinje fibers, bundle of His
b. sinoatrial node, AV node, AV bundle, Purkinje fibers
c. sinoatrial node, bundle of His, AV bundle, Purkinje fibers
d. sinoatrial node, Purkinje fibers, AV bundle, AV node
b. sinoatrial node, AV node, AV bundle, Purkinje fibers
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