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Explain open circulatory system

Explain open circulatory system in brief?

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Open circulatory system is the one in which blood doesn’t circulate merely within blood vessels however it also falls in cavities which irrigate tissues. In open circulatory system, the blood pressure is low and usually the blood (termed as hemolymph) has low cellularity.

Arthropods, molluscs (that is, the cephalopods are exception) and protochordates encompass open circulatory system.

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