Types of Circulatory Systems

Types of Circulatory Systems - the blood closed at all...

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Types of Circulatory Systems There are several types of circulatory systems. The open circulatory system , examples of which are diagrammed in Figure 2, is common to molluscs and arthropods. Open circulatory systems (evolved in insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. The resulting blood flow is sluggish. Vertebrates, and a few invertebrates, have a closed circulatory system , shown in Figure 2. Closed circulatory systems (evolved in echinoderms and vertebrates) have
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Unformatted text preview: the blood closed at all times within vessels of different size and wall thickness. In this type of system, blood is pumped by a heart through vessels, and does not normally fill body cavities. Blood flow is not sluggish. Hemoglobin causes vertebrate blood to turn red in the presence of oxygen; but more importantly hemoglobin molecules in blood cells transport oxygen. The human closed circulatory system is sometimes called the cardiovascular system. A secondary circulatory system, the lymphatic circulation , collects fluid and cells and returns them to the cardiovascular system....
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This note was uploaded on 11/29/2011 for the course BIO BSC1010 taught by Professor Gwenhauner during the Fall '10 term at Broward College.

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