Document Detail

Effects of salinity manipulations on blood pressures in an osmoconforming chordate, the hagfish, Eptatretus cirrhatus.
MedLine Citation:
PMID:  16868752     Owner:  NLM     Status:  MEDLINE    
Arterial and venous pressures were measured in hagfishes subjected to acute changes in salinity. The osmotic pressure of the seawater (SW) was increased or decreased by approximately 10%. Sixty minutes after the change in medium osmolarity the osmotic pressure of the blood corresponded with that of the medium. Following transfer to 90% SW all measured parameters changed as predicted for a passive increase in blood volume, apart from the pressure in the posterior cardinal vein (PCV) which fell. By 2 h dorsal aortic (DA) pressure and pressure in the PCV and supraintestinal vein had returned to pre-change values. In contrast, following exposure to 110% SW, pressures fell and apart from the supraintestinal vein they remained low at 120 min. At 24 h, DA pressure was lower than pre-change values for both groups. The data are consistent with the concept of central venous tone being regulated in hagfishes, which cope better with volume expansion than volume depletion.
J M Foster; M E Forster
Publication Detail:
Type:  Journal Article     Date:  2006-07-26
Journal Detail:
Title:  Journal of comparative physiology. B, Biochemical, systemic, and environmental physiology     Volume:  177     ISSN:  0174-1578     ISO Abbreviation:  J. Comp. Physiol. B, Biochem. Syst. Environ. Physiol.     Publication Date:  2007 Jan 
Date Detail:
Created Date:  2006-12-20     Completed Date:  2007-09-27     Revised Date:  2009-06-08    
Medline Journal Info:
Nlm Unique ID:  8413200     Medline TA:  J Comp Physiol B     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  31-9     Citation Subset:  IM    
School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand,
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MeSH Terms
Adaptation, Physiological
Blood Pressure / physiology*
Blood Volume / physiology
Circadian Rhythm / physiology
Hagfishes / physiology*
Osmolar Concentration
Seawater / chemistry*
Sodium Chloride / analysis
Time Factors
Venous Pressure / physiology
Water-Electrolyte Balance / physiology*
Reg. No./Substance:
7647-14-5/Sodium Chloride

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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