Intercalated discs occur:

Options

A. Between neurons
B. Between cardiac muscle fibres
C. At the junction of muscle and nerve cells
D. In striped muscles

Answer

**Step-by-Step Solution:**

1. **Understanding Intercalated Discs**: Intercalated discs are specialized structures found in certain types of muscle tissue. They play a crucial role in the function of the heart.

2. **Identifying the Type of Muscle Tissue**: The question asks where intercalated discs occur. It is essential to know the types of muscle tissues: cardiac muscle, skeletal muscle, and smooth muscle.

3. **Function of Intercalated Discs**: Intercalated discs serve as communication junctions between cardiac muscle cells. They allow for synchronized contraction of the heart muscle, enabling it to function effectively as a unit.

4. **Analyzing the Options**:
- **Option A**: Between neurons - This is incorrect as intercalated discs are not found between neurons; synapses are present instead.
- **Option B**: Between cardiac muscle fibers - This is correct as intercalated discs are specifically found between cardiac muscle fibers.
- **Option C**: At the junction of muscle and nerve cells - This is incorrect; intercalated discs are not present here.
- **Option D**: In striped muscle - This is misleading; while cardiac muscle is striated, intercalated discs are not found in skeletal muscle.

5. **Conclusion**: Based on the analysis, the correct answer is **Option B: Between cardiac muscle fibers**.

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