Question

What is correct about the heart of cockroach?

• A. Blood flows towards the posterior end of the body in the heart.
• B. The heart appears as an elongated tubular structure.
• C. Multi-chambered with ostia as the opening between the two chambers.
• D. All of the above.

Answer 1

Answer: (B)

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.