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An open circulatory system is a type of circulatory system found in some invertebrates, where blood is pumped into an open body cavity called a hemocoel. The organs are bathed in this blood, and nutrients and waste are exchanged directly with the cells. Unlike closed circulatory systems, which have blood contained within vessels, open circulatory systems have a more limited ability to control the flow and direction of blood.
It is called closed because all the plasma and its contents are contained wihtin vessels.
An open circulatory system is one that is not completely contained in vessels like arteries, veins, and capillaries.
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