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 regarding 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 Question**: The question asks about cell junctions and their permeability, specifically which one allows for easy passage of substances.

2. **Identify the Options**: The options provided are:
- A) Tight Junction
- B) Adhering Junction
- C) Gap Junction
- D) Desmosomes

3. **Analyze Each Option**:
- **Tight Junction**: These junctions are known for preventing leakage of substances between cells. They create a barrier that restricts the movement of solutes and water, making them NOT highly permeable.
- **Adhering Junction**: These junctions help in stabilizing cell-cell adhesion but do not facilitate the easy passage of substances. They are also NOT highly permeable.
- **Gap Junction**: These junctions consist of connexons that form channels between adjacent cells, allowing for the direct transfer of ions and small molecules. This makes them highly permeable and the correct answer.
- **Desmosomes**: These junctions provide mechanical strength and stability to tissues but do not allow for the passage of substances. They are NOT highly permeable.

4. **Select the Correct Answer**: Based on the analysis, the correct answer is **C) Gap Junction**.

### Final Answer:
The cell junction that is highly permeable and allows easy passage of substances across cell membranes is **Gap Junction**.