The direction of the impulse through the conduction system of the heart for each cardiac cycle is normally
a. AV node-SA node-bundle of His-Purkinje fibers.
b. AV node-bundle of His-SA node-Purkinje fibers.
c. bundle of His-AV node-Purkinje fibers-SA node.
d. SA node-AV node-bundle of His-Purkinje fibers.
e. SA node-bundle of His-Purkinje fibers-AV node.
D
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