In cockroach, the position of heart is

Options

A. Central
B. Dorsal
C. Ventral
D. Lateral

Answer

### Step-by-Step Text Solution:

1. **Understanding the Anatomy of Cockroach**: The cockroach has a complex body structure, and its circulatory system is an open type, which is different from the closed circulatory systems found in vertebrates.

2. **Identifying the Heart's Location**: The heart of the cockroach is a specialized structure known as the dorsal blood vessel. It runs along the back (dorsal side) of the cockroach's body.

3. **Heart Characteristics**: The cockroach heart is described as being pulsatile and is composed of 13 chambers. These chambers include 3 thoracic chambers and 10 abdominal chambers.

4. **Function of the Heart**: The heart of the cockroach is myogenic, meaning it contracts on its own due to the muscle tissue's inherent properties, rather than being stimulated by nerves. This contraction is facilitated by external alary muscles that help in the pumping action.

5. **Conclusion**: Based on the anatomical position and characteristics of the heart in cockroaches, we conclude that the heart is located on the dorsal side of the body.

### Final Answer:
The position of the heart in a cockroach is **dorsal**.

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