Which of the following wave in ECG marks the end of ventricular systole ?

Options

A. P - wave
B. Q - wave
C. QRS wave
D. T - wave

Answer

To solve the question "Which of the following wave in ECG marks the end of ventricular systole?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the ECG Waves**: The ECG (electrocardiogram) consists of several waves, each representing different phases of the heart's electrical activity. The main waves are:
- **P wave**: Represents atrial depolarization (systole).
- **QRS complex**: Represents ventricular depolarization (systole).
- **T wave**: Represents ventricular repolarization (diastole).

2. **Identify the Phases**:
- **Atrial Systole**: This occurs during the P wave.
- **Ventricular Systole**: This occurs during the QRS complex.
- **Ventricular Diastole**: This occurs after the T wave.

3. **Determine the End of Ventricular Systole**: The end of ventricular systole is marked by the completion of ventricular contraction and the beginning of ventricular relaxation. This transition is indicated by the T wave, which represents the repolarization of the ventricles.

4. **Select the Correct Answer**: Based on the understanding that the T wave signifies the end of ventricular systole, we can conclude that the correct answer is:
- **T wave** (Option 4).

### Final Answer:
The wave in ECG that marks the end of ventricular systole is the **T wave**.

---