Document Detail


The contribution of the parallel and series elastic components to the dynamic properties of the rat tail artery under two different smooth muscle tones.
MedLine Citation:
PMID:  7122207     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The dynamic elastic modulus (Ed) and the coefficient of wall viscosity (eta w) of the tail artery of normotensive rats were determined as functions of the circumferential wall stress under quasistatic and dynamic conditions. The experiments were performed under strong smooth muscle activation induced by norepinephrine, and during relaxation induced by papaverine. The following results were obtained. 1. Ed and eta w increase with increasing wall stress. At a given wall stress, Ed is virtually independent of frequency while eta w decreases markedly with increasing frequency. This behaviour of eta w is called thixotropy or pseudoplasticity. 2. In the wall stress range from 5--60 kPa the values of Ed, and in the wall stress range from 60--140 kPa those of eta w obtained under smooth muscle activation and during relaxation are virtually identical. 3. In the relaxed smooth muscle, the phase angles between sinusoidal pressure and radius changes area virtually independent of the mean wall stress at all frequencies. In the low stress range, the phase angles are greater at low frequencies in the activated state than in the relaxed state, decrease with increasing wall stress, and are virtually identical to the values under papaverine at high wall stresses. At high frequencies no dependence of the phase angles on the mean wall stress can be seen.
Authors:
R Busse; K Sturm; A Schabert; R D Bauer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pflügers Archiv : European journal of physiology     Volume:  393     ISSN:  0031-6768     ISO Abbreviation:  Pflugers Arch.     Publication Date:  1982 Jun 
Date Detail:
Created Date:  1982-12-02     Completed Date:  1982-12-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0154720     Medline TA:  Pflugers Arch     Country:  GERMANY, WEST    
Other Details:
Languages:  eng     Pagination:  328-33     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Arteries / anatomy & histology*
Female
Male
Mathematics
Models, Biological
Muscle Tonus* / drug effects
Muscle, Smooth, Vascular / physiology*
Norepinephrine / pharmacology
Papaverine / pharmacology
Rats
Tail
Chemical
Reg. No./Substance:
51-41-2/Norepinephrine; 58-74-2/Papaverine

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


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