Depolarization of atria is represented by which wave

Options

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

Answer

To answer the question "Depolarization of atria is represented by which wave?", we can follow these steps:

### Step-by-Step Solution:

1. **Understand the ECG Waves**: The electrocardiogram (ECG) consists of several waves that represent different phases of the heart's electrical activity. The main waves to focus on are the P wave, QRS complex, and T wave.

2. **Identify the P Wave**: The first wave in the ECG is the P wave. It is a small, positive, dome-shaped wave.

3. **Function of the P Wave**: The P wave specifically represents the depolarization of the atria. This means that when the P wave is present, it indicates that the atria are contracting (systole) due to the electrical signals from the sinoatrial (SA) node.

4. **Differentiate Other Waves**:
- The QRS complex represents the depolarization of the ventricles, which occurs after the atrial depolarization.
- The T wave represents the repolarization of the ventricles, indicating that the ventricles are relaxing.

5. **Conclusion**: Since the question asks specifically about the depolarization of the atria, the correct answer is the P wave.

### Final Answer:
The depolarization of the atria is represented by the **P wave**.

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