In cockroach, the dorsal chamber of hemocoel is called

Options

A. A pericardial sinus
B. perivisceral sinus
C. Perineural sinus
D. peritoneal sinus

Answer

To answer the question "In cockroach, the dorsal chamber of hemocoel is called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Body Cavity of Cockroach**:
- The body cavity of a cockroach is known as the hemocoel. It is filled with a fluid called hemolymph, which functions similarly to blood in vertebrates.

2. **Identify the Structure of Hemocoel**:
- The hemocoel is divided into three main sinuses by the presence of dorsal and ventral diaphragms. These sinuses are important for understanding the organization of the hemocoel.

3. **Identify the Sinuses**:
- The three main sinuses in the hemocoel are:
- **Pericardial Sinus**: This is the dorsal chamber that surrounds the heart and aorta.
- **Perivisceral Sinus**: This is the middle chamber that surrounds the visceral organs.
- **Perineural Sinus**: This is the ventral chamber that surrounds the ventral nerve cord.

4. **Determine the Correct Answer**:
- Since the question specifically asks for the dorsal chamber of the hemocoel, we identify that the pericardial sinus is the correct answer. It is the only sinus mentioned that is located dorsally.

5. **Eliminate Incorrect Options**:
- The other options provided (perivisceral sinus, perineural sinus, and peritoneal sinus) can be eliminated based on their descriptions:
- Perivisceral sinus is not dorsal; it is the middle chamber.
- Perineural sinus is ventral.
- Peritoneal sinus is not a recognized sinus in the context of cockroach anatomy.

### Final Answer:
The dorsal chamber of hemocoel in cockroach is called the **pericardial sinus**.

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