Question

Correct statement about circulatory system of cockroach is

• A. In has closed type of circulatory system
• B. It has a complicated type of circulatory system
• C. It has 13-chambered heart with a pair of ostia in each chamber
• D. It takes place without participation of tissues

Answer 1

Answer: (C)

It has 13-chambered heart with a pair of ostia in each chamber

The heart of the cockroach is elongated, thick, muscular, tubular and 13-chambered. It lies in the pericardial sinus of the hemocoel. Each chamber of the heart receives oxygenated blood from the dorsal sinus through one pair of slit-like openings called ostia. The heart contracts in a posteroanterior direction and the blood also flows posteroanterior. The alary muscles are responsible for the circulation of blood.

So the correct answer is 'It has a 13-chambered heart with a pair of ostia in each chamber'.