What is the Difference Between Open and Closed Circulatory Systems?
Diffusion is the simplest method that some organisms use to circulate things throughout the body. On the outside of the body are specialized cells that are exposed to water, which helps the organism's body eliminate waste. Additional cells are inside of the body and line the gastrovascular cavity. The purpose of these cells is to help carry nutrients that the organism needs using the process of diffusion. This type of system is typically seen in simpler organisms.
A common example of an open circulatory system can be seen in many insects. Then typically have a tube shaped heart that pumps a fluid known as hemolymph through the body. This fluid is composed of blood and tissues made by the body. The heart helps transport the hemolymph throughout the various channels within the body to the organs that require it. An example of one of these channels is the trachea, which allows the organism to take in the oxygen it requires and eliminate the carbon dioxide byproduct that is created.
The closed circulatory system is far more complex and is what is seen in human beings. It is a full cardiovascular system that is made up of very strong blood vessels and a central heart. Unlike an open circulatory system, the blood does not simply flow throughout the organism, but is contained strictly in the blood vessels. There are three types of various vessels that help with this process: arteries, veins, and capillaries. Working in conjunction with this system is the lymphatic system that helps by picking up tissue fluid that is not needed and bringing it back into the blood.
Source:
Benitz, Bill. Lecture: Human Biology. November 9, 2009
Published by John Smith
John has been writing online for several years. An avid hockey player and fan, he is enjoys writing sports articles, but is familiar with a wide variety of topics. View profile
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