Purkinje fibres are specialised

Options

A. nerve fibres
B. muscle fibres
C. collagen fibres
D. elastic fibres

Answer

### Step-by-Step Solution:

1. **Understanding Purkinje Fibers**:
- Purkinje fibers are specialized structures found in the heart. They play a crucial role in the conduction system of the heart, helping to coordinate the contraction of the heart muscles.

2. **Identifying the Options**:
- The options provided are:
- Nerve fibers
- Muscle fibers
- Collagen fibers
- Elastin fibers

3. **Analyzing the Function of Purkinje Fibers**:
- Purkinje fibers are responsible for conducting electrical impulses that trigger heart contractions. This indicates that they are involved in muscle activity rather than nerve signaling or providing structural support.

4. **Determining the Type of Fibers**:
- Given that Purkinje fibers are involved in the conduction of impulses in the heart, they must be a type of muscle fiber. Specifically, they are specialized cardiac muscle fibers.

5. **Conclusion**:
- Based on the analysis, the correct answer is that Purkinje fibers are specialized **muscle fibers**.

### Final Answer:
- Purkinje fibers are specialized **muscle fibers**.