Question:
The QRS complex in a normal ECG represents ________.
The QRS complex in a normal ECG represents ________.
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ECG trick: P = atria, QRS = ventricles contract, T = ventricles relax.
Updated On: May 4, 2026
- atrial depolarization
- ventricular depolarization
- atrial repolarization
- ventricular repolarization
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The Correct Option is B
Solution and Explanation
Concept:
An electrocardiogram (ECG) records the electrical activity of the heart during cardiac cycle.
Step 1: Understand ECG components.
• P wave → Atrial depolarization
• QRS complex → Ventricular depolarization
• T wave → Ventricular repolarization
Step 2: Interpret QRS complex. The QRS complex represents the rapid depolarization of ventricles, leading to ventricular contraction.
Step 3: Analyze options.
• (A) Atrial depolarization → P wave $\times$
• (B) Ventricular depolarization → Correct \checkmark
• (C) Atrial repolarization → Hidden within QRS $\times$
• (D) Ventricular repolarization → T wave $\times$
Step 4: Conclusion. \[ \text{QRS complex = Ventricular depolarization} \]
An electrocardiogram (ECG) records the electrical activity of the heart during cardiac cycle.
Step 1: Understand ECG components.
• P wave → Atrial depolarization
• QRS complex → Ventricular depolarization
• T wave → Ventricular repolarization
Step 2: Interpret QRS complex. The QRS complex represents the rapid depolarization of ventricles, leading to ventricular contraction.
Step 3: Analyze options.
• (A) Atrial depolarization → P wave $\times$
• (B) Ventricular depolarization → Correct \checkmark
• (C) Atrial repolarization → Hidden within QRS $\times$
• (D) Ventricular repolarization → T wave $\times$
Step 4: Conclusion. \[ \text{QRS complex = Ventricular depolarization} \]
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