Which one is devoid of macrophages ?

Options

A. Lymph nodes
B. Connective tissue
C. Lungs
D. None of the above

Answer

To answer the question "Which one is devoid of macrophages?", we will analyze each of the provided options step by step.

### Step 1: Analyze the Lymph Nodes
Lymph nodes are part of the lymphatic system and play a crucial role in the immune response. They contain a variety of immune cells, including macrophages. Macrophages in lymph nodes help filter lymph and remove pathogens. Therefore, lymph nodes are **not devoid of macrophages**.

**Hint:** Lymph nodes are immune organs that contain various immune cells, including macrophages.

### Step 2: Analyze Connective Tissue
Connective tissue is a type of tissue that supports, binds together, and protects other tissues and organs. Macrophages are derived from monocytes and are present in connective tissues throughout the body. They play a role in immune defense and tissue homeostasis. Thus, connective tissue is also **not devoid of macrophages**.

**Hint:** Connective tissue contains various cell types, including macrophages that originate from monocytes.

### Step 3: Analyze the Lungs
In the lungs, macrophages are known as alveolar macrophages or dust cells. These cells are essential for clearing out pathogens and debris from the alveoli (air sacs) in the lungs. Therefore, the lungs also contain macrophages and are **not devoid of macrophages**.

**Hint:** Alveolar macrophages are specialized cells in the lungs that help maintain respiratory health.

### Step 4: Evaluate the Options
Now that we have analyzed all the options:
- Lymph nodes: Contain macrophages.
- Connective tissue: Contains macrophages.
- Lungs: Contain macrophages.
- None of the above: This option suggests that all the previous options have macrophages.

Since all the options contain macrophages, the correct answer is **none of the above**.

**Final Answer:** None of the above.