Question

Open blood circulatory system is found in

• A. Earthworm
• B. Cockroach/Prawn
• C. Humans
• D. Cows

Answer 1

The correct option is B Cockroach/Prawn

A. Earthworm- It has a closed circulatory system. An earthworm circulates blood exclusively through vessels. There are three main vessels that supply the blood to organs within the earthworm. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels.

B. Cockroaches are equipped with open type circulatory system. In this, blood is pumped by the heart and flows openly in the body cavity. Organs floating in the blood get nutrition directly. Supply of oxygen is independent through a separate closed type respiratory system.

C. The humans have closed circulatory system.

D. Cows have closed circulatory system.

So, the correct answer is “Cockroach”.