ECG depicts the depolarisation and repolarisation process during the cardiac cycle. In the ECG of a normal healthy individual one of the following waves is not represented.

Options

A. Depolarisation of atria
B. Repolarisation of atria
C. Depolarisation of ventricle
D. Repolarisation of ventricles

Explanation

To solve the question regarding which wave is not represented in the ECG of a normal healthy individual, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Cardiac Cycle**: The cardiac cycle consists of one complete cycle of contraction (systole) and relaxation (diastole) of the heart. This cycle includes the electrical activity that triggers heartbeats.

2. **Identify the Components of ECG**: The electrocardiogram (ECG) displays the electrical activity of the heart through various waves:
- **P Wave**: Represents atrial depolarization.
- **QRS Complex**: Represents ventricular depolarization.
- **T Wave**: Represents ventricular repolarization.

3. **Analyze the Options**: The question provides four options regarding depolarization and repolarization:
- A) Depolarization of atria
- B) Repolarization of atria
- C) Depolarization of ventricles
- D) Repolarization of ventricles

4. **Determine Which Wave is Missing**:
- The P wave, QRS complex, and T wave are all represented in a normal ECG.
- However, the repolarization of the atria does not have a distinct wave in the ECG. It occurs during the QRS complex but is not visually represented as a separate wave.

5. **Conclusion**: Therefore, the wave that is not represented in the ECG of a normal healthy individual is the **repolarization of the atria** (Option B).

### Final Answer:
The wave that is not represented in the ECG of a normal healthy individual is the **repolarization of the atria**.

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