Document Detail

Hypoxia-induced changes in electrophysiological responses and associated calcium movements of flounder (Platichthys flesus) heart and gut.
MedLine Citation:
PMID:  1351447     Owner:  NLM     Status:  MEDLINE    
1. Flounder hearts subjected to hypoxic conditions showed a reduction in contractile force. After 85 min in hypoxia-inducing salines, hearts were almost totally quiescent. 2. Membrane potentials were seen to change in hearts during hypoxic conditions. The action potential gradually declined in height but increased in duration and the resting membrane potential was also seen to decrease. 3. Sections of flounder gut, when subjected to identical hypoxic conditions as the hearts, showed no significant changes in either mechanical activity or membrane potential. 4. Heart and gut tissues were placed in hypoxia-inducing salines containing 45Ca either immediately or after a previous 3 hr exposure to hypoxia-inducing salines. Uptake of 45Ca increased beyond control values in both heart and gut subjected immediately to hypoxia. After 3 hr hypoxia exposure, uptake of 45Ca was reduced in heart but was not significantly different from controls in gut. 5. The changes seen in 45Ca uptake were far greater in heart tissue than in gut tissue. 6. In all physiological parameters examined, the gut tissue of the flounder is far more tolerant to hypoxic conditions than heart tissue.
R Lennard; H Huddart
Related Documents :
7472947 - Severity of hypoxia predicts response to nitric oxide in a porcine pulmonary hypertensi...
20671717 - Systemic arterial pressure at maturity in rats following chronic hypoxia in early life.
24607677 - Birth weight and adult health in historical perspective: evidence from a new zealand co...
24426037 - Effect of different cooking methods on iodine losses.
18211997 - Effects of norepinephrine and glyceryl trinitrate on cerebral haemodynamics: transcrani...
576337 - Expansion pattern of terminal air-spaces in the premature rabbit lung after tracheal de...
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Comparative biochemistry and physiology. Comparative physiology     Volume:  101     ISSN:  -     ISO Abbreviation:  Comp. Biochem. Physiol. Comp. Physiol.     Publication Date:  1992 Apr 
Date Detail:
Created Date:  1992-07-21     Completed Date:  1992-07-21     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9441449     Medline TA:  Comp Biochem Physiol Comp Physiol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  717-21     Citation Subset:  IM    
Division of Biological Sciences, Lancaster University, Bailrigg, U.K.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Anoxia / physiopathology*
Biological Transport
Calcium / metabolism*
Flounder / physiology*
Heart / physiopathology*
Intestines / metabolism*,  physiopathology
Membrane Potentials
Myocardial Contraction
Myocardium / metabolism*
Reg. No./Substance:

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

Previous Document:  Effects of arginine vasotocin, cortisol and adrenergic factors on water balance in the toad Bufo buf...
Next Document:  The effects of hypoxic stress on the fine structure of the flounder heart (Platichthys flesus).