Using the ECG recording provided below, how do we know that this extrasystole event (i.e., indicated by the arrow) is occurring in the ventricles and not the atria?  a. None of the options are correct b. Extrasystole event is smaller in amplitude than the QRS complex c.Event occurs after a T-wave d.Large ECG amplitude compared with the P-wave e.Event occurs after a P-wave

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
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Chapter1: The Human Body: An Orientation
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Using the ECG recording provided below, how do we know that this extrasystole event (i.e., indicated by the arrow) is occurring in the ventricles and not the atria? 

a. None of the options are correct

b. Extrasystole event is smaller in amplitude than the QRS complex

c.Event occurs after a T-wave
d.Large ECG amplitude compared with the P-wave
e.Event occurs after a P-wave
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