Question

Which of the following is the correct statement about the circulatory system of cockroach?

• A. It is closed type of circulatory system.
• B. It is a complicated type of circulatory system.
• C. It takes place without the participation of tissue.
• D. It has 13 chambered heart and in each segment one pair of ostia are present.

Answer 1

Answer: (D)

It has 13 chambered heart and in each segment one pair of ostia are present.

Body cavity of cockroach is known as hemocoel as it remains filled with hemolymph (blood). The heart is present along the mid-dorsal line of the body. The heart of cockroach is an elongated muscular tube. It consists of 13 segmentally arranged funnel-shaped chambers. In between the 2 chambers, a pair of ostia is present. The heart receives oxygenated blood from the dorsal sinus through ostia. It extends from the tip of the head up to the abdominal end. The alary muscles hold the heart in position.