Explain about the function of the blood ves- sels that connect arterioles and venules.

Explanation

### Step-by-Step Solution:

1. **Identify the Blood Vessels**: The blood vessels that connect arterioles and venules are called **capillaries**.

2. **Structure of Capillaries**: Capillaries are thin-walled, microscopic vessels. They have a very small diameter, approximately **8 microns**. The walls of capillaries are composed of a single layer of **squamous epithelial cells**, which allows for easy exchange of substances.

3. **Function of Capillaries**: The primary function of capillaries is to facilitate the exchange of materials between the blood and the tissues. This includes:
- **Transporting Nutrients**: Capillaries deliver essential nutrients from the blood to the surrounding tissues.
...