Desmosomes are concerned with

Options

A. cytolysis
B. cellular excretion
C. cell division
D. cell adherence

Answer

### Step-by-Step Solution

1. **Understanding Desmosomes**: Desmosomes are specialized structures that form connections between adjacent cells. They are important for maintaining the structural integrity of tissues.

2. **Function of Desmosomes**: The primary function of desmosomes is to provide adhesion between cells. They act like rivets, anchoring the cells together and helping to resist mechanical stress.

3. **Components of Desmosomes**: Desmosomes consist of a dense protein plaque on the inner surface of the plasma membrane, which is linked to intermediate filaments of the cytoskeleton. These intermediate filaments extend into the cytoplasm of the cell, providing strength and support.

4. **Comparison with Other Processes**:
- **Cytolysis**: This refers to the breaking down of the cell, which is not related to desmosomes.
- **Cellular Excretion**: This involves the removal of waste materials from the cell, which is also not a function of desmosomes.
- **Cell Division**: This process involves the replication and division of genetic material and cytoplasm, which is separate from the function of desmosomes.

5. **Conclusion**: Based on the above points, desmosomes are primarily concerned with cell adherence, linking adjacent cells together and providing structural support.

### Final Answer
Desmosomes are concerned with **cell adherence**.

---