Document Detail


Ionic mechanisms controlling behavioral responses of paramecium to mechanical stimulation.
MedLine Citation:
PMID:  5768366     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A mechanical stimulus applied to the anterior part of Paramecium causes a transient increase in membrane permeability to calcium. This permits a calcium current to flow into the cell, causing the membrane potential to approach the equilibrium level for calcium. The transient depolarization which results elicits a reversal in the direction of ciliary beat. When the organisms are free-swimming this is seen as the reversed locomotion of Jennings' "avoiding reaction." In contrast, a mechanical stimulus applied to the posterior part results in increased permeability to potassium ions, and hence an outward potassium current. The hyperpolarization which results causes an increase in the frequency of ciliary beat in the normal direction. In free-swimming specimens this is seen as an increase in the velocity of forward locomotion.
Authors:
Y Naitoh; R Eckert
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  164     ISSN:  0036-8075     ISO Abbreviation:  Science     Publication Date:  1969 May 
Date Detail:
Created Date:  1969-06-26     Completed Date:  1969-06-26     Revised Date:  2011-12-07    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  963-5     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Avoidance Learning
Calcium / metabolism
Cell Membrane Permeability*
Cilia
Locomotion*
Paramecium*
Potassium / metabolism
Sensory Receptor Cells
Chemical
Reg. No./Substance:
7440-09-7/Potassium; 7440-70-2/Calcium

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


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