When an electrical impulse reaches the AV node, it is slowed for a brief period of time so that:
A. blood can pass from the atria to the ventricles.
B. blood returning from the body can fill the atria.
C. the impulse can spread through the Purkinje fibers.
D. the SA node can reset and generate another impulse.
Answer: A. blood can pass from the atria to the ventricles.
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