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The pause in impulse conduction from the sinoatrial node (SAN) to the ventricles, facilitated by the atrioventricular node (AVN), ensures that the atria and ventricles do not contract at the same time.

1. This ensures that the atria fully expel their contents before the ventricles begin contracting.
2. This ensures that the ventricles contract prior to atrial contraction.
3. This halts the contraction of the atria.
4. This halts the contraction of the ventricles.

Correct answer: This ensures that the atria fully expel their contents before the ventricles begin contracting.

Solution

The AV node slows conduction so the atria can complete contraction and push blood into the ventricles before ventricular systole begins. This timing improves ventricular filling and prevents both chambers from contracting simultaneously.

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