15 Difference between Open And Closed circulatory system

Open circulatory systemClosed circulatory system
Hemolymph directly washes the organs and tissues.The blood flows inside the closed vessels.
The blood & the interstitial liquid can’t be identified.Blood & interstitial fluid are different.
Present in mollusks & arthropods.Present in annelids & vertebrates.
Blood is pumped into the body cavity.Blood is pumped through the vessels by the heart.
Dorsal blood vessels present.Dorsal & ventral blood vessels are present.
Blood is in direct contact with the tissues.Blood is not in direct contact with the tissues.
Nutrients are transferred directly among blood and tissues.The nutrients are exchanged via tissue fluid.
No transportation of gases takes place.Transportation of gases takes place.
The fluid that is circulating in the system is described as “hemolymph”.The Fluid which is circulating in this system is called blood.
No respiratory pigments are present.Presence of Respiratory pigments.
The volume of blood cannot be managed.Volume of blood can be controlled by compression and relaxation of blood vessels.
The flow of Blood is slow.The Blood flow is fast.
The open sections are termed as sinuses and lacunae.The closed spaces involve arteries and veins.
Organisms with OCS: Snails, clams, cockroaches and spiders.Organisms with CCS: Humans, squids, Cats, earthworms.