Explanation

Heart of cockroach is a pulsatile 13-chambered structure. It is present below the tergal plates middorsaly in the thorax and abdomen. Its inhalant openings are called ostia, which are guarded by valves. This heart is infact, the dorsal blood vessel, which pulsates with the help of external alary muscles. The blood in heart flow uniderectionally from posterior end to the anterior end of the body.