What are open and closed circulatory system
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Closed circulatory systems have the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. Open circulatory system. The open circulatory system is common to molluscs and arthropods.
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In an open circulatory system, the blood constituents flow freely in body, whereas in closed circulatory system the blood flows in blood vessels.
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