PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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These 2 events occur during the QRS wave on an ECG.
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Ventricles and Atria Repolarize
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Ventricles and Atria Depolarize
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Ventricles Repolarize and Atria Depolarize
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Ventricles Depolarize and Atria Repolarize
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Explanation:
Detailed explanation-1: -The QRS complex is a result of ventricular depolarization and indicates the start of ventricular contraction. The T wave results from ventricular repolarization and signals the beginning of ventricular relaxation. The electrical signal for atrial repolarization is masked by the larger QRS complex.
Detailed explanation-2: -As the human Ta wave of atrial repolarization occurs during the PR segment and QRS complex, it is not observed and recorded widely in sinus rhythm subjects by the standard 12-lead ECG (1).
Detailed explanation-3: -The T wave on the ECG (T-ECG) represents repolarization of the ventricular myocardium.
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