T wave in a standard ECG represents

Options

A. Initiation of the ventricular contraction
B. ventricular diastole
C. End of systole
D. Contraction of both the atria

Answer

To answer the question regarding what the T wave in a standard ECG represents, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding ECG Waves**: The electrocardiogram (ECG) consists of several waves, each corresponding to specific electrical activities of the heart. The main waves are the P wave, QRS complex, and T wave.

2. **Identifying the P Wave**: The P wave is the first wave in the ECG and represents atrial depolarization, which occurs when the sinoatrial (SA) node sends electrical impulses to the atria, causing them to contract (atrial systole).

3. **Identifying the QRS Complex**: The QRS complex follows the P wave and represents ventricular depolarization. This occurs when the electrical impulse travels from the SA node to the atrioventricular (AV) node, then through the bundle of His and the Purkinje fibers, leading to the contraction of the ventricles (ventricular systole).

4. **Identifying the T Wave**: The T wave is the last wave in the ECG cycle. It represents ventricular repolarization, which is the process of the ventricles relaxing after contraction. This phase is known as ventricular diastole.

5. **Conclusion**: Based on the understanding of the ECG waves, we conclude that the T wave represents ventricular diastole.

### Final Answer:
The T wave in a standard ECG represents **ventricular diastole**.

---