| The cardiac responses to shell opening and closure in the bivalve Arctica islandica (L.). | |
MedLine Citation:
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PMID: 932636 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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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. |
Authors:
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A C Taylor |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: The Journal of experimental biology Volume: 64 ISSN: 0022-0949 ISO Abbreviation: J. Exp. Biol. Publication Date: 1976 Jun |
Date Detail:
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Created Date: 1976-09-01 Completed Date: 1976-09-01 Revised Date: 2003-11-14 |
Medline Journal Info:
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Nlm Unique ID: 0243705 Medline TA: J Exp Biol Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 751-9 Citation Subset: IM |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Heart Rate / drug effects Mollusca / physiology* Oxygen / pharmacology |
| Chemical | |
Reg. No./Substance:
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7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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