Question

The circulatory system in cockroach consists of

• A. Heart, sinuses and alary muscle
• B. Cardiac muscle, heart, blood vessels
• C. Blood vessels, heart, atrium
• D. Veins, heart and atrium

Answer 1

The correct option is A Heart, sinuses and alary muscle

The heart of the cockroach is located in the pericardial sinus. the heart is 13 chambered. It is divided segmentally into chambers that are separated by valves (Ostia) to ensure one-way flow of hemolymph. A pair of alary muscles is attached laterally to the walls of each chamber which contracts and relax for easy flow of the blood. The empty space which is fluid filled is known as sinus. So, the correct answer is option A.