Which type of cell surface junctions abundantly occur in epithelial tissues?

Options

A. Nexus
B. Desmosomes
C. Zona occludence
D. Plasmodesmata

Answer

To answer the question, "Which type of cell surface junctions abundantly occur in epithelial tissues?" we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Types of Cell Junctions**:
- The question provides several options: nexus, desmosomes, zonula occludens, and plasmodesmata.
- We need to understand what each of these junctions is.

2. **Understand Epithelial Tissue Characteristics**:
- Epithelial tissues are characterized by closely packed cells with minimal extracellular matrix. They serve as protective barriers and are involved in absorption, secretion, and sensation.

3. **Analyze Each Junction Type**:
- **Nexus (Gap Junctions)**: These are intercellular connections that allow for communication between cells but are not the most abundant in epithelial tissues.
- **Desmosomes**: These are strong intercellular junctions that provide mechanical stability by anchoring cells together. They are formed by proteins called cadherins and are abundant in epithelial tissues.
- **Zonula Occludens (Tight Junctions)**: These junctions seal adjacent epithelial cells together, preventing the passage of molecules between them. They are important but not as abundant as desmosomes.
- **Plasmodesmata**: These are cell junctions found in plant cells, allowing for communication and transport of materials between cells. They are not present in epithelial tissues.

4. **Determine the Most Abundant Junction**:
- Among the junctions listed, desmosomes are the most prevalent in epithelial tissues due to their role in providing structural integrity and strength.

5. **Conclusion**:
- Therefore, the type of cell surface junctions that abundantly occur in epithelial tissues is **desmosomes**.

### Final Answer:
Desmosomes are the type of cell surface junctions that abundantly occur in epithelial tissues.

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