The primary function of the atrioventricular (AV) node is to:
A. serve as the backup pacemaker if the ventricular conduction system fails.
B. regenerate the atrial-initiated electrical impulse before it enters the ventricles.
C. increase conduction from the atria to the ventricles to allow for atrial filling.
D. slow conduction from the atria to the ventricles to allow for ventricular filling.
Answer: D. slow conduction from the atria to the ventricles to allow for ventricular filling.
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