Trace the wave of depolarization through the heart.
A. AV node ? atria ? SA node ? ventricles ? Purkinje fibers ? bundle of His
B. SA node ? atria ? AV node ? bundle of His ? Purkinje fibers ? ventricles
C. AV node ? atria ? SA node ? Purkinje fibers ? bundle of His ? ventricles
D. SA node ? atria ? ventricles ? AV node ? bundle of His ? Purkinje fibers
Answer: B
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