Name various types of cells found in the matrix of areolar connective tissue.

Explanation

### Step-by-Step Solution:

1. **Understanding Areolar Connective Tissue**: Areolar connective tissue is classified as a loose connective tissue. This means that the cells and fibers within its matrix are not densely packed, allowing for a significant amount of space.

2. **Matrix Composition**: The matrix of areolar connective tissue is semi-fluid, which contributes to the loose arrangement of its components. This semi-fluid ground substance is crucial for the function of the tissue.

3. **Identifying Cell Types**: The matrix of areolar connective tissue contains various types of cells, each with distinct functions. The main types of cells found in this tissue include:
- **Fibroblasts**: These are the most common cells in areolar tissue. They are responsible for producing fibers (like collagen and elastin) and the ground substance of the matrix, which forms the connective tissue.
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