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SA Node

Which part of the conduction system initiates the depolarizing impulse, which spreads throughout the heart?

electrical activity in the heart

What does the ECG wave tracing represent?

ventricular depolarization

What does the QRS complex represent in the ECG wave tracing?

P wave

Contraction of the atria results from which wave of depolarization on the ECG tracing?

AV node

Which part of the intrinsic conduction system delays the impulse briefly before it moves on to the ventricles?

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