Plasmalemma of two adjacent cells are fussed in case of

Options

A. terminal bars
B. tight junctions
C. microvilli
D. desmosomes

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the condition in which the plasmalemma (cell membrane) of two adjacent cells are fused together.

2. **Identifying Cell Junctions**: There are several types of cell junctions that connect adjacent cells, such as tight junctions, desmosomes, and terminal bars. Each of these has different characteristics and functions.

3. **Explaining Tight Junctions**: Tight junctions are specialized connections between adjacent cells that create a barrier. They effectively fuse the plasma membranes of the two cells, preventing the passage of materials between them. This is crucial in epithelial tissues where a selective barrier is needed.

4. **Comparing Other Junctions**:
- **Desmosomes**: These are structures that provide strong adhesion between cells but do not fuse the membranes. They act more like glue, holding cells together without sealing them.
- **Terminal Bars**: These are related to the connection of epithelial cells but do not specifically refer to the fusion of membranes.

5. **Conclusion**: Given that the question specifically asks about the fusion of the plasmalemma of two adjacent cells, the correct answer is tight junctions.

### Final Answer:
The plasmalemma of two adjacent cells are fused in the case of **tight junctions**.

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