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The Evolution of Organ Systems$
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Andreas Schmidt-Rhaesa

Print publication date: 2007

Print ISBN-13: 9780198566687

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198566687.001.0001

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Circulatory systems

Circulatory systems

(p.191) CHAPTER 10 Circulatory systems
The Evolution of Organ Systems

A. Schmidt-Rhaesa

Oxford University Press

Fluids are transported in different ways through animal bodies, but several animals possess a specific system for this purpose: the circulatory system. This can be an open system of clefts and interstities, a closed system of tubelike structures (vessels), or a combination of the two. In most cases, circulatory vessels are limited and formed by coelom epithelia of adjacent coelomic compartments. They are lined by extracellular matrix and represent the primary body cavity (the blood vascular system). In only a few cases do circulatory vessels have an epithelium, and are then coelomic circulatory systems. The occurrence, shape, and extension of circulatory systems among animals are very diverse and this chapter concludes that their multiple parallel evolution has to be assumed.

Keywords:   blood vascular system, coelomic circulatory system, blood, hemolymph, vessels

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