Differentiate between closed circulatory system and open circulatory system.

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Closed circulatory system Open circulatory system
$(1)$ Blood is circulated through a closed network of blood vessels. $(1)$ Blood is pumped into body cavities or sinuses.
$(2)$ Blood capillaries are present to facilitate exchange. $(2)$ Blood capillaries are absent.
$(3)$ Respiratory pigments are usually present within $RBCs$ or dissolved in plasma. $(3)$ Respiratory pigments are always dissolved in the blood plasma.
$(4)$ Lymph acts as an intermediate medium between blood and cells. $(4)$ Direct exchange occurs between blood and tissues.
$(5)$ Example: Earthworm,Humans. $(5)$ Example: Cockroach,Molluscs.

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