Zoology - Structural Organisation in Animals Question with Solution | TestHub

A cockroach possesses a 13-chambered tubular, muscular, elongated and neurogenic heart.
Blood circulation in cockroach is maintained by wing-shaped alary muscles (involuntary).
Each chamber of the heart receives blood from the sinus through 1 pair of slit-like openings called ostia.

The flow of blood can be represented as:

Blood in heart$\to$Pumped into the sinuses$\to$Re-enter the heart by ostia$\to$Again pumped into the sinuses.