CBSE Class 10 Answered

In open blood circulatory system, the blood is not constrained to closed vessels whereas the blood never leaves the vessels in case of closed system.

The heart in closed system pumps blood whereas in open system, the heart pulls the blood into it when it relaxes.

Movement of blood is helped by locomotion of the organism and muscle contractions in open system, whereas in closed, blood is moved by the pumping of the heart.

In open circulatory system, the fluid hemolymph is present in a cavity called the hemocoel. It bathes the organs directly and there is no distinction between blood and interstitial fluid; this combined fluid is called hemolymph

It is present in lower phyla like molluscs and arthropods