What substances are the elastic fibers of connective tissue made of? What are some of the functions of these fibers?

Explanation

### Step-by-Step Solution:

1. **Identify the Composition of Elastic Fibers**:
- The elastic fibers of connective tissue are primarily made up of a protein called **elastin**. Elastin is a highly elastic protein that allows tissues to resume their shape after stretching or contracting.

2. **Location of Elastic Fibers**:
- These fibers are found abundantly in the **walls of arteries**. Their presence in this location is crucial for the proper functioning of the cardiovascular system.

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