distinguish between open and closed circulation
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In the open circulation, the blood is not enclosed in the blood vessels and is pumped into a cavity called hemocoel. On the contrary, in the closed circulation, the blood is pumped through the vessels separate from the interstitial fluid of the body.
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Open Circulatory System Closed Circulatory System
The hemolymph directly bathes the organs and tissues. The blood circulates within closed vessels.
The blood and interstitial fluid cannot be distinguished. Blood and interstitial fluid are distinct.
Present in molluscs and arthropods. Present in annelids and vertebrates.
Blood is pumped into the body cavity. Blood is pumped through the vessels by the heart.
Dorsal blood vessel present. Dorsal and ventral blood vessels present
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