Which of the following is correct for the circulatory system of cockroach?

It is present on the dorsal side and it has thirteen units of heart in abdominal region

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It is present on the ventral side and it has ten abdominal and three thoracic units of heart

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It is present on the ventral side and it has thirteen units of heart in abdominal region

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It is present on the dorsal side and it has ten abdominal and three thoracic units of heart

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Solution

The correct option is D It is present on the dorsal side and it has ten abdominal and three thoracic units of heart
Heart of cockroach is a dorsal, pulsatile 13 chambered (ten abdominal and three thoracic) structure. This heart is, in fact, the dorsal blood vessel, which pulsates with the help of external alary muscles, that is why it is also called as myogenic heart. Thus the correct answer is option D.

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