The physiological function of the relatively slow conduction through the AV node is to allow sufficient time for:
A. filling of the ventricles
B. runoff of blood from the aorta to the arteries
C. repolarization of ventricles
D. venous return to the atria
E. contraction of ventricles
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When the positive terminal is placed on the left arm and the negative terminal is placed on the right arm, the lead is known as a
A. I limb lead
B. II limb lead
C. aVR lead
D. aVF lead
E. aVL lead
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