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Humans have a closed circulatory system.

In the open circulation, the blood is not enclosed in the blood vessels and is pumped into a cavity called hemocoel. On the contrary, in the closed circulation, the blood is pumped through the vessels separate from the interstitial fluid of the body.

Humans have a closed circulatory system. The blood is enclosed in the vessels and the heart while circulating. The blood travels through arteries and veins and carries important molecules throughout the body.

In a closed circulatory system, the blood is transferred faster than an open circulatory system. That is why the closed circulatory system is more advantageous than the open system.

The main components of a (closed) circulatory system include:



Blood vessels

The insects have an open circulatory system. Unlike humans, the blood in the insects flows freely throughout the body.

Almost all multicellular organisms need a circulatory system to transport oxygen and nutrients through the body. Evolution has led to the existence of two types of circulatory systems namely:

The main difference between the open and closed circulatory system is the way blood flows in an organism. Blood can flow through vessels inside the body such as arteries and veins. This type of circulation is called closed circulation. Open circulation happens when there are no vessels to contain the blood and it flows freely through the cavities of the body.

Vertebrates and few a invertebrates have closed circulatory system. The open circulatory system, on the other hand, is most commonly seen in  invertebrates  such as cockroaches and crabs.

The other major difference between open and closed circulatory system are summarized below:

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The hemolymph directly bathes the organs and tissues.

The blood circulates within closed vessels.

The blood and interstitial fluid cannot be distinguished.

Blood and interstitial fluid are distinct.

Present in molluscs and arthropods.

Present in annelids and vertebrates.

Blood is pumped into the body cavity.

Blood is pumped through the vessels by the heart.

Dorsal and ventral blood vessels present.

Blood is in direct contact with the surrounding tissues.

Blood is not in direct contact with the tissues.

Nutrients are exchanged directly between blood and tissues.

The nutrients are exchanged via tissue fluid.

The fluid flowing in this system is called hemolymph.

Fluid flowing in this system is called blood.

No respiratory pigments are present.

The volume of blood cannot be controlled.

The volume of blood can be controlled by the contraction and relaxation of blood vessels.

The open spaces are called sinuses and lacunae.

Closed spaces involve arteries and veins.

Organisms with OCS: Snails, clams, cockroaches and spiders.

Organisms with CCS: Humans, squids, cats, earthworms.