Question

How does circulation in the cockroach? occur? Explain.

Answer 1

Circulation in the cockroach: In cockroach, nutrients and waste products are transported by the open circulatory system. In cockroach, there is a main dorsal vessel termed as heart or aorta. It is a muscular tube, which has 13 chambers. The heart is pulsating. In it, blood flows from the posterior portion to the anterior portion Heart or aorta opens at the apex of the anterior portion The blood in an anterior part of the body, leaves the aorta and spread through large open spaces in the body called sinuses. The blood now trickles backward through the sinuses and reaches all cells. Finally, blood returns to the aorta, through a valve-like opening in the heart. Thus, the blood circulation is completed. Blood has no pigment, so it is not helpful in the exchange of gases. For the exchange of gases, there is a tracheal system.