Which muscles have the intercalated discs ? What is their role ?

Explanation

### Step-by-Step Solution:

1. **Identify the Muscle Type**: The first step is to determine which type of muscle contains intercalated discs. Intercalated discs are specific to cardiac muscle.

2. **Define Intercalated Discs**: Intercalated discs are specialized structures found at the junctions between cardiac muscle cells. They are dense junctions that facilitate communication and connection between these cells.

3. **Explain the Role of Intercalated Discs**: The primary role of intercalated discs is to enable the coordinated contraction of cardiac muscle cells. They allow for the rapid transmission of electrical impulses, which is essential for the rhythmic beating of the heart.

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