Read the following statements and choose the correct answer.
(i) Gap junctions cement adjacent cells together.
(ii) Areolar tissue contains fibroblasts , macrophages and mast cells.
(iii) Tight junctions facilitate the cells to communicate with each other
(iv) Adhering junctions help to stop substances from leaking across tissues
(v) Cells of connective tissue except blood secrete fibres of structural proteins called elastin.

Options

A. `i` and ii and iii only are wrong
B. `i` , iii and iv only are wrong
C. iii and v only are wrong
D. `i` , ii and v only are wrong .

Answer

To solve the question, we need to evaluate each of the provided statements regarding their correctness. Let's analyze them step by step:

### Step 1: Analyze the first statement
**Statement (i): Gap junctions cement adjacent cells together.**
- **Explanation:** Gap junctions are specialized intercellular connections that allow direct communication between adjacent cells through protein channels called connexons. They do not physically cement cells together; rather, they facilitate the transport of ions and small molecules between cells.
- **Conclusion:** This statement is **incorrect**.

### Step 2: Analyze the second statement
**Statement (ii): Areolar tissue contains fibroblasts, macrophages, and mast cells.**
- **Explanation:** Areolar tissue is a type of loose connective tissue that indeed contains various cell types, including fibroblasts (which produce fibers), macrophages (which are involved in immune response), and mast cells (which play a role in allergic reactions).
- **Conclusion:** This statement is **correct**.

### Step 3: Analyze the third statement
**Statement (iii): Tight junctions facilitate the cells to communicate with each other.**
- **Explanation:** Tight junctions are connections between adjacent cells that prevent the leakage of materials between them. They do not facilitate communication; instead, they seal the cells together to maintain the integrity of tissues.
- **Conclusion:** This statement is **incorrect**.

### Step 4: Analyze the fourth statement
**Statement (iv): Adhering junctions help to stop substances from leaking across tissues.**
- **Explanation:** Adhering junctions (or adherens junctions) do provide mechanical stability by linking the cytoskeletons of adjacent cells, but they do not primarily function to prevent leakage. This is the role of tight junctions.
- **Conclusion:** This statement is **incorrect**.

### Step 5: Analyze the fifth statement
**Statement (v): Cells of connective tissue except blood secrete fibers of structural proteins called elastin.**
- **Explanation:** Connective tissue cells (excluding blood) do secrete structural proteins, including elastin, which provides elasticity to tissues. This statement is accurate.
- **Conclusion:** This statement is **correct**.

### Final Conclusion:
- The correct statements are: **(ii) and (v)**.
- The incorrect statements are: **(i), (iii), and (iv)**.

### Answer:
The correct option is the one that identifies statements (ii) and (v) as correct.

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