In cockroach, heart comprises of

Options

A. 4 chambers
B. 2 chambers
C. 8 chambers
D. 13 chambers

Explanation

### Step-by-Step Solution:

1. **Identify the Organ**: The question asks about the heart of the cockroach. The cockroach belongs to the class Insecta within the phylum Arthropoda.

2. **Understand the Structure**: The heart of a cockroach is not like a mammalian heart. It is a long, tubular structure that runs along the mid-dorsal line of the thorax and abdomen.

3. **Count the Chambers**: The cockroach heart is comprised of 13 chambers. Each of these chambers is funnel-shaped and is designed to facilitate the flow of hemolymph (the insect equivalent of blood).

4. **Function of the Chambers**: The chambers of the heart have openings called ostia. These ostia allow hemolymph from the body sinuses (known as hemocoel) to enter the heart. The heart pumps the hemolymph from the posterior end to the anterior end, and then it is directed into the anterior aorta.

5. **Conclusion**: Therefore, the heart of the cockroach comprises 13 chambers.

### Final Answer:
The heart of the cockroach comprises **13 chambers**.

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