What is open type circulation
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Open circulatory systems are systems where blood, rather than being sealed tight in arteries and veins, suffuses the body and may be directly open to the environment at places such as the digestive tract. Open circulatory systems use hemolymph instead of blood.
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In this blood is pumped by heart passes through large vessels into large open spaces or body cavities called blood sinuses.
Tissues are in direct Contact with circulating fluid
EXAMPLE :-
Arthropods , molluscs.
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