Cardiovascular Changes Under Normoxic and Hypoxic Conditions in the Air-breathing Teleost Synbranchus Marmoratus: Importance of the Venous System.
From: Zoophysiology, Department of Biological Sciences, University of Aarhus, 8000 Aarhus, Denmark. marianne.skals@biology.au.dk
The Journal of experimental biology
- Publish Date: Oct 2006
- ISSN: 0022-0949
- Volume: 209
- Issue: Pt 20
- Pages: 4167-73
- Medium: Print
- Language: English
- Citation (JAMA): Skals Marianne, Skovgaard Nini, Taylor Edwin W, et al. Cardiovascular Changes Under Normoxic and Hypoxic Conditions in the Air-breathing Teleost Synbranchus Marmoratus: Importance of the Venous System.. J. Exp. Biol. Oct 2006;209:4167-73
Abstract
Synbranchus marmoratus is a facultative air-breathing fish, which uses its buccal cavity as well as its gills for air-breathing. S. marmoratus shows a very pronounced tachycardia when it surfaces to air-breathe. An elevation of heart rate decreases cardiac filling time and therefore may cause a decline in stroke volume (V(S)), but this can be compensated for by an increase in venous tone to maintain stroke volume. Thus, the study on S. marmoratus was undertaken to investigate how stroke volume and venous function are affected during air-breathing. To this end we measured cardiac output (Q), heart rate (f(H)), central venous blood pressure (P(CV)), mean circulatory filling pressure (MCFP), and dorsal aortic blood pressures (P(DA)) in S. marmoratus. Measurements were performed in aerated water (P(O2)>130 mmHg), when the fish alternated between gill ventilation and prolonged periods of apnoeas, as well as during hypoxia (P(O2)
Mesh Headings (Keywords): Air, Animals, Anoxia, Cardiovascular System, Epinephrine, Gills, Receptors, Adrenergic, alpha, Receptors, Adrenergic, beta, Respiration, Smegmamorpha, Veins, Water
Check for Full Text / PubMed Unique Identifier (PMID): 17023609
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