Give the difference between open and closed system of circulation.

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	Open system of circulation	Closed system of circulation
1	It is present in lower organisms, eg., cockroach.	It is present in higher organisms, eg., human.
2	In this system blood flows through open spaces thus, blood is in direct contact with tissue fluids.	In this system blood flows through closed system of blood vessels thus, blood is in indirect contact with tissue fluids.
3	In this system, blood pressure is low hence, this system is less active than closed system of circulation.	In this system, blood pressure is high hence, this system is more active than open system.