Which of the following wave of ECG shows ventricular depolarization

Options

A. P wave
B. QRS wave
C. T wave
D. U wave

Answer

To determine which wave of the ECG (electrocardiogram) shows ventricular depolarization, we can analyze the different components of the ECG waveforms.

### Step-by-Step Solution:

1. **Understand the Components of ECG**: The ECG consists of several waves, primarily the P wave, QRS complex, T wave, and sometimes a U wave. Each of these waves corresponds to different electrical activities of the heart.

2. **Identify the P Wave**: The P wave represents atrial depolarization. This is the electrical activity that leads to the contraction of the atria. Since the question asks for ventricular depolarization, the P wave is not the correct answer.

3. **Examine the QRS Complex**: The QRS complex is a combination of three deflections (Q, R, and S waves) and is associated with ventricular depolarization. During this phase, the electrical impulses spread through the ventricles, leading to their contraction. Therefore, this is the correct answer to the question.

4. **Look at the T Wave**: The T wave represents ventricular repolarization, which is the process of the ventricles recovering after contraction. This does not indicate depolarization, so it is not the correct answer.

5. **Consider the U Wave**: The U wave is not always present in an ECG and is not typically associated with ventricular depolarization. It is often considered a normal variant and does not play a significant role in the primary phases of cardiac electrical activity.

### Conclusion:
The wave that shows ventricular depolarization is the **QRS complex**.

### Final Answer:
The correct answer is the **QRS complex**.

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