In which one of the following preparations are you likely to come across cell junctions most frequently ?

Options

A. Tendon
B. Thrombocytes
C. Hyaline cartilage
D. Ciliated epithelium

Answer

To determine in which preparation cell junctions are most frequently encountered, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cell Junctions**:
- Cell junctions are specialized structures that connect cells together. They are crucial for maintaining tissue integrity and facilitating communication between cells.

2. **Types of Cell Junctions**:
- There are several types of cell junctions, including tight junctions, adhering junctions, gap junctions, and desmosomes. Each type has specific functions and locations in the body.

3. **Identifying Epithelial Tissues**:
- Epithelial tissues are known to have a high density of cell junctions. They line various organs and structures in the body, such as the stomach, intestines, and urinary bladder.

4. **Specific Locations of Tight Junctions**:
- Tight junctions, a specific type of cell junction, are predominantly found in epithelial tissues that line the stomach, intestines, and urinary bladder. These junctions help to prevent the passage of substances between cells, maintaining a barrier.

5. **Ciliated Epithelium**:
- Ciliated epithelium is a type of epithelial tissue that has hair-like structures (cilia) on its surface. This type of epithelium is also found in the respiratory tract and certain parts of the reproductive system.

6. **Conclusion**:
- Given that tight junctions and adhering junctions are frequently found in epithelial tissues, particularly in ciliated epithelium, the preparation where you are likely to come across cell junctions most frequently is in ciliated epithelium.

### Final Answer:
- The correct option is **Ciliated Epithelium**.