Document Detail

The cardiac responses to shell opening and closure in the bivalve Arctica islandica (L.).
MedLine Citation:
PMID:  932636     Owner:  NLM     Status:  MEDLINE    
Shell closure in Arctica islandica is followed by an exponential decrease in the oxygen tension of the mantle cavity water and is accompanied by an initial increase in heart rate which is followed at lower oxygen tensions by a bradycardia. Prior to shell opening there is a slight increase in heart rate before any movement of the shell valves can be detected. However, once the shell opens and pumping activity recommences there is a rapid increase in heart rate, often to levels above normal. Perfusion of the mantle cavity with water of high and low oxygen tension resulted in the cardiac responses normally associated with shell opening and closure. Recordings of the PO2 of the blood in the ventricle, made simultaneously with cardiac recordings, showed that the changes in heart rate were recorded only after the PO2 of the blood had changed. These experiments suggest that changes in the PO2 of the mantle cavity water may be primarily responsible for the cardiac responses to shell closure in Arctica.
A C Taylor
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  64     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  1976 Jun 
Date Detail:
Created Date:  1976-09-01     Completed Date:  1976-09-01     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  751-9     Citation Subset:  IM    
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MeSH Terms
Heart Rate / drug effects
Mollusca / physiology*
Oxygen / pharmacology
Reg. No./Substance:

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

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