Ventricular depolarization is represented by __________.

Options

A. P wave
B. QRS complex
C. T wave
D. P and T waves

Answer

To determine what represents ventricular depolarization, we need to analyze the components of an electrocardiogram (ECG). Here’s a step-by-step solution:

1. **Understanding the ECG Waves**: The ECG consists of several waves, primarily the P wave, QRS complex, and T wave. Each wave corresponds to different electrical activities of the heart.

2. **Identifying the P Wave**: The P wave represents the depolarization of the atria. This is the phase when the atria contract to push blood into the ventricles.

3. **Identifying the QRS Complex**: The QRS complex is crucial as it represents the depolarization of the ventricles. This is when the ventricles contract to pump blood out of the heart, either to the lungs or the rest of the body.

4. **Identifying the T Wave**: The T wave indicates the repolarization of the ventricles, which is the phase when the ventricles relax after contraction.

5. **Conclusion**: Since the question specifically asks about ventricular depolarization, the correct answer is the QRS complex.

Thus, the answer to the question "Ventricular depolarization is represented by __________." is the **QRS complex**.