Alveolar macrophages and splenic macrophages are 

Options

A. wandering macrophages
B. fixed macrophages
C. resting macrophages
D. vestigeal macrophages

Answer

To answer the question about alveolar macrophages and splenic macrophages, we need to analyze the characteristics of these cells and their classification. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Understanding Macrophages**:
- Macrophages are a type of white blood cell (WBC) that play a crucial role in the immune system. They are involved in the process of phagocytosis, where they engulf and digest foreign pathogens and particles.

**Hint**: Remember that macrophages are specialized WBCs that help in fighting infections.

2. **Types of Macrophages**:
- Macrophages can be categorized based on their location and function. They can be classified as either fixed or wandering macrophages. Fixed macrophages are stationary and reside in specific tissues, while wandering macrophages can move throughout the body.

**Hint**: Think about whether the macrophages are stationary or mobile in the body.

3. **Location of Alveolar and Splenic Macrophages**:
- Alveolar macrophages are located in the alveoli of the lungs, where they help in clearing pathogens and debris from the respiratory system.
- Splenic macrophages are found in the spleen, where they filter blood and remove old or damaged cells.

**Hint**: Consider the specific organs where these macrophages are found and their roles in those locations.

4. **Classification of Alveolar and Splenic Macrophages**:
- Both alveolar and splenic macrophages are considered **fixed macrophages**. This means they are not wandering or mobile; instead, they are anchored in their respective tissues and perform their functions at those sites.

**Hint**: Recall that fixed macrophages are those that do not migrate and are stationed in specific locations.

5. **Conclusion**:
- Therefore, the correct classification for both alveolar macrophages and splenic macrophages is that they are **fixed macrophages**.

**Hint**: Summarize the characteristics of fixed macrophages to reinforce your understanding.

### Final Answer:
Alveolar macrophages and splenic macrophages are **fixed macrophages**.