In the standard ECG of a normal person, the P-wave represents the

Options

A. atrial depolarisation
B. ventricular depolarisation
C. atrial repolarisation
D. ventricular repolarisation

Answer

### Step-by-Step Solution:

1. **Understanding the ECG Waves**: The electrocardiogram (ECG) is a graphical representation of the electrical activity of the heart. It consists of several waves, including P waves, QRS complexes, and T waves.

2. **Identifying the P Wave**: In the standard ECG, the P wave is the first wave observed. It is crucial to understand what this wave signifies in the cardiac cycle.

3. **Function of the P Wave**: The P wave represents the depolarization of the atria. This is the electrical activity that leads to the contraction of the atrial muscles, pushing blood into the ventricles.

4. **Evaluating the Options**:
- **Option 1: Atrial Depolarization** - This is correct as it directly correlates with the function of the P wave.
- **Option 2: Ventricular Depolarization** - This is incorrect. Ventricular depolarization is represented by the QRS complex.
- **Option 3: Atrial Repolarization** - This is also incorrect. Atrial repolarization is not represented by the P wave.
- **Option 4: Ventricular Repolarization** - This is incorrect as well. Ventricular repolarization is represented by the T wave.

5. **Conclusion**: Based on the analysis, the P wave in a standard ECG of a normal person represents **Atrial Depolarization**.

### Final Answer:
The P-wave represents **Atrial Depolarization**.

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