In the region of joining of two cardiac muscle cells is present

Options

A. Ligament
B. Basement
C. Intercalated disc
D. Fibres.

Answer

**Step-by-Step Solution:**

1. **Understanding Cardiac Muscle Cells**: Cardiac muscle cells are specialized cells found in the heart. They have unique structural features that differentiate them from other types of muscle cells.

2. **Identifying the Joining Region**: When two cardiac muscle cells connect, they do so at a specific region that allows for efficient communication and contraction.

3. **Recognizing the Unique Feature**: The region where two cardiac muscle cells join is known as the intercalated disc. This structure is crucial for the function of cardiac muscle.

4. **Function of Intercalated Discs**: Intercalated discs contain gap junctions and desmosomes, which facilitate the synchronized contraction of the heart muscle. This synchronization is essential for effective pumping of blood.

5. **Eliminating Incorrect Options**:
- **Ligament**: Connects bone to bone, not applicable here.
- **Basement Membrane**: Found in various tissues but not specifically in cardiac muscle.
- **Fibres**: A general term that does not specifically refer to the joining of cardiac muscle cells.

6. **Conclusion**: The correct answer to the question is "intercalated disc," as it is the specific structure present at the junction of two cardiac muscle cells.

**Final Answer**: Intercalated disc

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