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Open circulatory systems are systems where blood, rather than being sealed tight in arteries and veins, suffuses the body and may be directly open to the environment at places such as the digestive tract. Open circulatory systems use hemolymph instead of blood.
Open and Closed Circulatory System. The main difference between the open and closed circulatory systems 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.
An open circulatory system, found in arthropods, pumps blood into a cavity called a hemocoel where it surrounds the organs and then returns to the heart (s) through ostia (openings). The blood found in arthropods, a mix of blood and interstitial fluid, is called hemolymph.
Humans have a closed circulatory system, while many mollusks and other invertebrates have an open system. In a closed circulatory system, blood is enclosed within blood vessels. The following image is a diagram of the closed circulatory system in a human.
Open Circulatory Systems. In higher animals, there are two primary types of circulatory systems: open and closed. Arthropods and mollusks have an open circulatory system. In this type of system, there is neither a true heart nor capillaries as are found in humans.
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Open circulatory system. In arthropods, the open circulatory system is a system in which a fluid in a cavity called the hemocoel bathes the organs directly with oxygen and nutrients, with there being no distinction between blood and interstitial fluid; this combined fluid is called hemolymph or haemolymph. [28]
The circulatory system is effectively a network of cylindrical vessels: the arteries, veins, and capillaries that emanate from a pump, the heart. In all vertebrate organisms, as well as some invertebrates, this is a closed-loop system, in which the blood is not free in a cavity.
In an open circulatory system, the blood is not enclosed in the blood vessels but is pumped into a cavity called a hemocoel and is called hemolymph because the blood mixes with the interstitial fluid.
Invertebrate animals have a great variety of liquids, cells, and modes of circulation, though many invertebrates have what is called an open system, in which fluid passes more or less freely throughout the tissues or defined areas of tissue.