Question

Which of the following is correct for the circulatory system of a cockroach?
A. It is present on the dorsal side and it has thirteen units of heart in the abdominal region
B. It is present on the ventral side and it has ten abdominal and three thoracic units of heart
C. It is present on the ventral side and it has thirteen units of heart in the abdominal region
D. It is present on the dorsal side and it has ten abdominal and three thoracic units of heart

Answer 1

Hint: Cockroaches have an open circulatory system.The insect contains an open type of systemic circulation with blood flowing through blood spaces. The circulatory system of cockroaches is simple, consisting of only the heart and primary artery. Organs swimming in the blood are fed directly.

Complete answer: Cockroaches have the open circulatory system. The blood rushes into a single platform of 13 chambers with three thoracic units of heart. The dorsal side, where the circulatory system is located, is positioned at the top of the cockroach, serving to deliver oxygen-rich blood to each heart chamber. Instead of blood, hemolymph carries nutrients that are either yellow or white. The heart will not beat on its own, however. Muscles in the cavity expand and stretch to help the heart deliver the hemolymph to the rest of the body. The abdominal of the cockroach is divided into ten parts. The 7th part, along with the 8th and 9th part, has a wide reproductive pocket. The 10th section contains a pair of partnered filamentous structures called anal cerci. Thus, the circulatory system present on the dorsal side of cockroach has ten sections of the abdomen and three units of thoracic units of heart.
Hence, the correct answer is option D.

Additional information: Cockroaches have a fairly tiny head and a long, flat body, most of the insects are reddish-brown to dark brown. They have wide eyes, long flexible antennae. The portions of the mouth are also on the underside of the head and include general chewing jaws, salivary glands and multiple tastes and touch sensors. The wings of the insects are connected to the second and third thoracic areas.

Note: Cockroaches are insects with so few particular adaptations and may be one of the most basic living organisms. The body is divided into some kind of three-segment thoracic and ten-segment abdominal. The outermost layer has a robust outer shell that comprises calcium carbonate and supports the internal organs and attaches to the muscles.