Which one of the following has an open circulatory system?
Correct answer: C. Periplaneta
- A. Octopus
- B. Hirudinaria
- C. Periplaneta
- D. All of these
Explanation
Periplaneta, commonly known as the American cockroach, does have an open circulatory system. Open circulatory systems are found in insects and other invertebrates. In an open circulatory system, the blood flows freely in the body cavity and bathes the organs directly. There is no heart to pump the blood through the body. In Periplaneta, the blood flows through a series of tubes called hemocoel. The hemocoel is divided into two chambers: the pericardial sinus and the perivisceral sinus. The pericardial sinus surrounds the heart, and the perivisceral sinus surrounds the organs.
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