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What are open circulatory systems?

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Open circulatory systems are found in mollusks, arthropods and several other invertebrates. Open circulatory systems work by pumping blood into a hemocoel, which in turn diffuses blood and pumps it back into the circulatory system. Blood is then pumped by the heart into cavities, organs and tissues of the organism.

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Open circulatory systems contain three primary organs: a heart, gill and pericardial sinus. These systems are more basic in structure and complexity of organs than closed circulatory systems, which are found in a few invertebrates and most vertebrates, including humans. The hearts of organisms with open circulatory systems, such as crayfish, contain a single atrium, which serves as a central terminal for recycling and circulating blood.

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