The impulse of heart beat originate from-

Options

A. SAN
B. AVN
C. Vagus nerve
D. All of these

Answer

To answer the question "The impulse of heart beat originates from-", we can follow these steps:

1. **Understanding the Structure of the Heart**: The human heart is composed of cardiac muscle tissue. It has specialized regions that are responsible for initiating and conducting electrical impulses.

2. **Identifying the Key Component**: Within the heart, there is a specific area located in the right atrium known as the Sinoatrial (SA) node. This area is crucial for the heart's function.

3. **Function of the SA Node**: The SA node is often referred to as the "pacemaker" of the heart. This is because it generates electrical impulses that initiate each heartbeat.

4. **Rate of Impulse Generation**: The SA node typically generates impulses at a rate of 70 to 75 beats per minute, which sets the pace for the heart's rhythm.

5. **Conclusion**: Therefore, the impulse of the heartbeat originates from the SA node.

### Final Answer:
The impulse of heart beat originates from the SA node (Sinoatrial node).