1. Closed circulation is more efficient than
open circulation.
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Closed Circulatory Systems The closed circulatory system separates the tissue fluid from blood. The blood is pumped through a closed system of arteries, veins, and capillaries. ... Still, blood can flow backward and the system is only slightly more efficient than the open system of insects.
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A closed system is more efficient because of the driving force of the pressure allowing oxygenated blood to reach more distant parts of the body faster and more efficiently. Insects and Mollusks use open systems.
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