The correct order of structures found in cockroach from dorsal to ventral surface of body

Options

A. Heart to Gut to Nerve cord
B. Gut to Heart to Nerve cord
C. Nerve cord to Gut to Heart
D. Heart to Nerve cord to Gut

Answer

To determine the correct order of structures found in a cockroach from the dorsal to the ventral surface of its body, we need to understand the anatomical arrangement of its internal structures. Here’s a step-by-step solution:

### Step-by-Step Solution:

1. **Identify the Orientation**:
- The cockroach body is dorsoventrally flattened, meaning it has a distinct dorsal (top) and ventral (bottom) side.

2. **Understand the Body Structure**:
- The cockroach body is divided into three main parts: head, thorax, and abdomen.
- The dorsal side is covered by a hard exoskeleton made of chitin, while the ventral side is softer.

3. **Locate the Heart**:
- The heart of the cockroach is located on the dorsal side of the body. It is a long tube that runs along the midline of the back.

4. **Locate the Gut**:
- The gut, which is responsible for digestion, is situated beneath the heart. It runs through the body from the mouth to the anus.

5. **Locate the Nerve Cord**:
- The ventral nerve cord is located on the ventral side of the body. It runs along the belly of the cockroach and is responsible for transmitting signals throughout the body.

6. **Establish the Correct Order**:
- Based on the locations identified:
- Dorsal: Heart
- Middle: Gut
- Ventral: Nerve Cord
- Therefore, the correct order from dorsal to ventral is: **Heart → Gut → Nerve Cord**.

### Final Answer:
The correct order of structures found in a cockroach from dorsal to ventral surface of the body is **Heart → Gut → Nerve Cord**.

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