Which of the following cell junction is highly permeable and
cause easy passage of substance across the cell membranes ?

Options

A. Tight junction
B. Adhering junctions
C. Gap junctions
D. Desmosomes

Answer

To solve the question about which cell junction is highly permeable and allows easy passage of substances across cell membranes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Types of Cell Junctions**:
- There are several types of cell junctions, including tight junctions, adhering junctions, gap junctions, and desmosomes. Each serves different functions in cellular organization and communication.

2. **Analyze Each Option**:
- **Tight Junctions**: These junctions create a seal between adjacent cells, preventing the passage of substances. They are not permeable.
- **Adhering Junctions**: These junctions help to anchor cells together but do not facilitate the passage of substances.
- **Gap Junctions**: These junctions allow for direct communication between adjacent cells by forming channels that permit the passage of ions and small molecules. They are highly permeable.
- **Desmosomes**: These are specialized structures that provide mechanical strength to tissues but do not allow for the passage of substances.

3. **Identify the Highly Permeable Junction**:
- Among the options, gap junctions are the only type that allows for the easy passage of substances between cells due to their channel-like structure.

4. **Conclusion**:
- The correct answer is **gap junctions**, as they are highly permeable and facilitate the movement of substances across cell membranes.

### Final Answer:
**Gap Junctions**

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