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The venous circulation -a piscine perspective

Artikel i vetenskaplig tidskrift
Författare Erik Sandblom
Michael Axelsson
Publicerad i Comparative biochemistry and physiology - Part A: Molecular & integrative physiology
Volym 148
Nummer/häfte 4
Sidor 785–801
ISSN 1095-6433
Publiceringsår 2007
Publicerad vid Zoologiska institutionen
Sidor 785–801
Språk en
Länkar dx.doi.org/10.1016/j.cbpa.2007.08.0...
Ämnesord central venous pressure, exercise, fish, hypoxia, mean circulatory filling pressure, temperature, vascular capacitance
Ämneskategorier Zoofysiologi, Biologiska vetenskaper

Sammanfattning

Vascular capacitance describes the pressure-volume relationship of the circulatory system. The venous vasculature, which is the main capacitive region in the circulation, is actively controlled by various neurohumoral systems. In terrestrial animals, vascular capacitance control is crucial to prevent orthostatic blood pooling in dependent limbs, while in aquatic animals like fish, the effects of gravity are cancelled out by hydrostatic forces making orthostatic blood pooling an unlikely concern for these animals. Nevertheless, changes in venous capacitance have important implications on cardiovascular homeostasis in fish since it affects venous return and cardiac filling pressure (i.e. central venous blood pressure), which in turn may affect cardiac output. The mean circulatory filling pressure is used to estimate vascular capacitance. In unanaesthetized animals, it is measured as the central venous plateau pressure during a transient stoppage of cardiac output. So far, most studies of venous function in fish have addressed the situation in teleosts (notably the rainbow trout, Oncorhynchus mykiss), while any information on elasmobranchs, cyclostomes and air-breathing fishes is more limited. This review describes venous hemodynamic concepts and neurohumoral control systems in fish. Particular emphasis is placed on venous responses to natural cardiovascular challenges such as exercise, environmental hypoxia and temperature changes.

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