Question

Which of the following statements is correct about the type of junction and their role in our body?

• A. Adhering junctions facilitate the cells to communicate with each other
• B. Tight junctions help to stop substances from leaking across a tissue
• C. Tight junctions help to perform cementing to keep neighbouring cells together
• D. Gap junctions help to create gap between the cells and tissues.

Answer 1

The Correct Option is B

To solve this question, we need to understand the roles of different types of cellular junctions present in the human body. Junctions between cells are crucial because they maintain tissue integrity and facilitate communication. Let's analyze each option in the context of cellular biology:

1. Adhering junctions facilitate the cells to communicate with each other: This statement is incorrect. Adhering junctions, also known as desmosomes, primarily function to bind cells together, providing mechanical support. They are not primarily involved in communication.
2. Tight junctions help to stop substances from leaking across a tissue: This statement is correct. Tight junctions are a type of junction that forms a seal around the cell, preventing the passage of molecules and ions through the space between cells. This function is essential in tissues that require a controlled environment, such as epithelial layers.
3. Tight junctions help to perform cementing to keep neighboring cells together: This statement is also partly correct but is not the primary role. While tight junctions do help to bind cells, the primary function is to prevent leakage between them, not just to act as "cement."
4. Gap junctions help to create a gap between the cells and tissues: This statement is incorrect. Gap junctions are specialized intercellular connections that facilitate the direct transfer of ions, nutrients, and other small molecules between cells, allowing them to communicate directly. They do not create gaps between cells; instead, they create channels that directly connect the cytoplasm of adjacent cells.

Based on the definitions and functions of these junctions, the correct answer is: Tight junctions help to stop substances from leaking across a tissue.