Which term describes the ventricular contraction that occurs after activation via the Purkinje network?

Which term describes the ventricular contraction that occurs after activation via the Purkinje network?

• A. Purkinje Fibers
• B. QRS Complex
• C. Sinus Bradycardia
• D. QT Interval

Answer: (B)

The rapid ventricular contraction after the impulse travels through the Purkinje network is represented on an ECG by the QRS complex. This spike reflects ventricular depolarization, the electrical event that triggers the ventricles to contract. The Purkinje fibers are the fast-conducting pathways that deliver the impulse quickly to the ventricular myocardium, ensuring the ventricles depolarize and contract in a coordinated, synchronized way. Purkinje fibers describe the conduction system itself, not the contraction. Sinus bradycardia is simply a slow heart rate originating from the sinus node, which is a rate problem rather than a ventricular depolarization signal. The QT interval measures the entire time from the start of ventricular depolarization to the end of ventricular repolarization, encompassing more than just the contraction phase.

The rapid ventricular contraction after the impulse travels through the Purkinje network is represented on an ECG by the QRS complex. This spike reflects ventricular depolarization, the electrical event that triggers the ventricles to contract. The Purkinje fibers are the fast-conducting pathways that deliver the impulse quickly to the ventricular myocardium, ensuring the ventricles depolarize and contract in a coordinated, synchronized way.

Purkinje fibers describe the conduction system itself, not the contraction. Sinus bradycardia is simply a slow heart rate originating from the sinus node, which is a rate problem rather than a ventricular depolarization signal. The QT interval measures the entire time from the start of ventricular depolarization to the end of ventricular repolarization, encompassing more than just the contraction phase.