Zoology - Structural Organisation in Animals Question with Solution | TestHub

Circulatory system in cockroach: It is open type. Blood vessels are poorly developed and the open into haemocoel or open spaces. Body fluid present in haemocoel is also known as haemolymph. Blood is colourless as there is no respiratory pigment. Blood does not perform the function of transporting gases. Circulatory system consists of heart, aorta, haemocoel and haemolymph. The visceral organs bath in the fluid equivalent to blood in most invertebrates called hemolymph.