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Difference between Open and Closed Circulatory System

Difference between Open and Closed Circulatory System

The circulatory system is a network of organs and vessels that transport blood, nutrients, oxygen, and waste products around the body. There are two types of circulatory systems: open and closed. The difference between the open and closed circulatory system relates to the way blood flows through the body.

In an open circulatory system, blood flows through sinuses (channels) in the tissue and returns to the heart via veins. In a closed circulatory system, blood flows through veins and arteries, which are separated by tissues called septa. Septa prevent the mixing of arterial and venous blood. This article will explore the key differences between open and closed circulatory systems.

What is an Open Circulatory System?

The Open Circulatory System is a system where the heart pumps the blood through the body and the veins and arteries are not closed. The Open Circulatory System is found in arthropods, such as crabs, and some mollusks, such as squid. The Open Circulatory System is less efficient than the Closed Circulatory System, but it is less expensive to maintain. The Open Circulatory System does not need as much energy to pump the blood because the blood is not under as much pressure. The Open Circulatory System is advantageous for small animals because they do not need a lot of energy to circulate their blood.

What is a Closed Circulatory System?

A Closed Circulatory system is a system where the blood is always contained within the blood vessels. The Closed Circulatory system has four main components: the heart, arteries, capillaries, and veins. Closed circulatory systems are found in animals that have a body mass large enough that diffusion alone cannot effectively distribute oxygen and nutrients throughout their bodies.

The Closed Circulatory system helps to ensure that all of the cells in the body receive a continuous supply of oxygen and nutrients. The Closed Circulatory system also helps to remove waste products from cells and transport them to organs where they can be eliminated from the body. The Closed Circulatory system is essential for the proper functioning of the body and for maintaining good health.

Difference between Open and Closed Circulatory System

  • Open Circulatory System Open circulatory systems are found in invertebrates such as insects, crabs, and lobsters. The open circulatory system consists of vessels that carry fluid within the body cavity and bathe the organs directly. The topic sentence is the first sentence in a paragraph, and it states the main idea of the paragraph. The main idea is also sometimes called the controlling idea or the central idea. Every paragraph should have one main idea.
  • The open circulatory system doesn’t have blood vessels to separate blood from interstitial fluid. Arthropods have an open circulatory system, which means that their hemolymph doesn’t travel through vessels. Open circulatory systems don’t have true hearts, although some may have a dorsal aorta that pumps hemolymph into the body cavity where it will circulate around organs before returning to the heart.
  • Open circulatory systems are less efficient because hemolymph doesn’t come into direct contact with all of the cells in an organism’s body. Closed Circulatory System Closed circulatory systems are found in annelids, mollusks, chordates, and echinoderms.


The open circulatory system is found in invertebrates while the closed circulatory system is found in vertebrates. Although both systems have their own benefits and drawbacks, the open circulatory system seems to be more efficient when it comes to exchanging gases and nutrients with the environment. In addition, this system is also less costly to maintain.

However, one of its major disadvantages is that it can be quite messy! The closed circulatory system has some clear advantages over its counterpart; for example, it prevents fluid loss and keeps pathogens out of the bloodstream. Ultimately, which type of circulatory system a particular species possesses depends on a range of factors such as habitat and lifestyle.

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