Purkinje fibres mainly help in contraction of `:-`

Options

A. Right auricle
B. Left ventricle
C. Ventricles
D. Aorta

Answer

### Step-by-Step Solution:

1. **Understanding Purkinje Fibres**:
- Purkinje fibres are specialized muscle fibres located in the heart. They are part of the heart's conduction system.

2. **Location of Purkinje Fibres**:
- These fibres are found in the walls of the ventricles of the heart. They spread throughout the ventricles.

3. **Function of Purkinje Fibres**:
- The primary function of Purkinje fibres is to conduct electrical impulses that trigger the contraction of the heart muscle.

4. **Contraction of the Heart**:
- The heart has two main types of chambers: atria and ventricles. The contraction of the ventricles is crucial for pumping blood to the lungs and the rest of the body.

5. **Conclusion**:
- Since Purkinje fibres are responsible for conducting impulses that lead to the contraction of the ventricles, we conclude that Purkinje fibres mainly help in the contraction of the **ventricles**.

### Final Answer:
Purkinje fibres mainly help in the contraction of the **ventricles**.

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