List important parts of circulatory system of cockroach?

Explanation

### Step-by-Step Solution:

1. **Understand the Circulatory System Type**:
- The circulatory system of a cockroach is classified as an open circulatory system. This means that the blood (hemolymph) is not always contained within blood vessels and can flow freely in the body cavity.

2. **Identify the Major Components**:
- The main components of the cockroach's circulatory system include:
- **Heart**: The heart of the cockroach is a crucial component. It is a 13-chambered structure located below the tergal plates, primarily in the thorax and abdomen.
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