The cell junction responsible for the bearing of cardiac muscle as an unit is :

Options

A. Intercalated disc
B. Interdigitations
C. Desmosomes
D. Skeletal muscles

Answer

To solve the question regarding the cell junction responsible for the bearing of cardiac muscle as a unit, we can follow these steps:

### Step 1: Understand the Structure of Cardiac Muscle
Cardiac muscle is unique in its structure and function compared to other muscle types. It consists of interconnected cells that work together to contract and pump blood.

**Hint:** Remember that cardiac muscle cells are not isolated; they need to communicate effectively to function as a unit.

### Step 2: Identify Key Features of Cardiac Muscle Cells
Cardiac muscle cells, or cardiomyocytes, are connected by specialized structures that facilitate communication and coordination. These structures are crucial for the synchronized contraction of the heart.

**Hint:** Think about how cells in the heart communicate with each other to ensure they contract at the same time.

### Step 3: Examine the Options Provided
1. **Intercalated Disc**: These are specialized junctions between cardiac muscle cells that allow for rapid transmission of electrical impulses and mechanical coupling.
2. **Interdigitation**: This refers to the interlocking of cell membranes but is not specific to cardiac muscle.
3. **Desmosomes**: These are structures that anchor cells together but do not specifically refer to the functional unit of cardiac muscle.
4. **Skeletal Muscles**: This is a type of muscle tissue, not a junction.

**Hint:** Focus on the option that describes a junction specifically designed for cardiac muscle function.

### Step 4: Analyze the Function of Intercalated Discs
Intercalated discs contain gap junctions and desmosomes, which are essential for the transmission of electrical signals and mechanical strength. They enable the heart muscle to contract as a single unit, which is vital for effective pumping.

**Hint:** Consider how the heart needs to function as a coordinated unit rather than as individual cells.

### Step 5: Conclusion
Based on the analysis, the correct answer to the question is **Intercalated Disc**. This structure is specifically responsible for the bearing of cardiac muscle as a unit, allowing for synchronized contraction and efficient heart function.

**Final Answer:** Intercalated Disc