18. The Heart
Electrical Conduction System of the Heart
Multiple Choice
Multiple ChoiceWhich structure or structures are most directly responsible for allowing contraction of the ventricles to begin at the apex of the heart rather than in the septum closer to the AV node?
A
Purkinje fibers.
B
Sinoatrial and atrioventricular nodes.
C
AV bundle and the left and right bundle branches.
D
Atrial conducting fibers.
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