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 thanclosedsystem of circulation. | In this system, blood pressure is high hence, this system is more active than open system. |