Origin of heart beat and its conduction is represented by

Options

A. Av node `rarr` Bundle of His `rarr` SA node `rarr ` Purkinje fibre
B. SA node `rarr` Purkinje fibres `rarr` AV node `rarr` Bundle of His
C. Purkinje fibres `rarr` AV node `rarr `AV node `rarr `Bundle of His
D. SA node `rarr` AV node `rarr` Bundle of His `rarr` Purkinje fibres

Answer

### Step-by-Step Solution:

1. **Understanding the Heartbeat**: The heartbeat is a vital function of the heart, responsible for pumping blood throughout the body. It is an automatic process that continues throughout a person's life.

2. **Role of the Pacemaker**: The origin of the heartbeat is initiated by the heart's natural pacemaker, known as the Sinoatrial (SA) node. This node generates electrical impulses that trigger heart contractions.

3. **Conduction Pathway**: After the SA node generates an impulse, it travels to the Atrioventricular (AV) node. The AV node acts as a relay station, slowing down the impulse before it moves to the ventricles.

4. **Bundle of His**: From the AV node, the electrical signal travels through the Bundle of His, which is a pathway that conducts impulses from the AV node to the ventricles.

5. **Purkinje Fibers**: Finally, the impulse reaches the Purkinje fibers, which spread throughout the ventricles, causing them to contract and pump blood out of the heart.

6. **Correct Sequence**: The correct sequence of the conduction pathway is:
- SA Node → AV Node → Bundle of His → Purkinje Fibers

7. **Conclusion**: Therefore, the origin of the heartbeat and its conduction is represented by the sequence involving the SA node, AV node, Bundle of His, and Purkinje fibers.