The Arterial System
1992; Academic Press; Linguagem: Inglês
10.1016/s1546-5098(08)60332-5
ISSN1557-8011
AutoresPeter G. Bushnell, David R. Jones, Anthony P. Farrell,
Tópico(s)Aquaculture Nutrition and Growth
ResumoThis chapter describes the arterial system of fishes. The primary circulation of fishes follows the typical vertebrate pattern in that a heart forces blood into a ventral aorta, which then gives off paired vessels that arch upward among successive gill clefts and rejoin to form the dorsal aorta. The primary circulation is remarkably constant in general form in cyclostomes, elasmobranchs, and teleosts. Major modifications of the posterior branchial arteries occur in air-breathing fishes. For efficient gas exchange, water flow over the gills and blood flow through the gills should be continuous. Continuous blood flow may be achieved by the elastic recoil of blood vessel walls stretched during systolic ejection. The best estimate of the extent of this windkessel function of the ventral aortic system is from flow measurements made on the main vessel, either just outside the conus or bulbus or between pairs of branchial arteries. Recordings from these situations show major differences between flow patterns in cyclostomes and elasmobranchs on the one hand and teleosts on the other, although these flow patterns may not be truly indicative of gill blood flow. The pressure and flow relationships in the ventral and dorsal aortas are also elaborated in the chapter.
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