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      Distensibility of Capillaries in the Bat Wing

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          Abstract

          Preliminary experiments in our laboratory have shown that the distensibility characteristics of the capillary compartment in the bat wing depended upon its location in the vascular tree. The capillaries were then divided into arteriolar, middle and venular segments (according to their proximity to precapillary sphincters or nonmuscular venules). The bat was enclosed in an airtight box, one wing protruding through a slit and extended over a glass plate for microscopic observations. Continuous recordings of the diameter of the capillary segments were obtained; after 5 min of control recordings, the box pressure was raised in steps of 25 mm Hg to a maximum of 100 mm Hg and then returned to control level. The duration of each step was 4 min. Each increase of the pressure led to the dilatation of the capillary, but its arteriolar segment appeared to be more distensible than the middle and venous ones. After shifting the box pressure, the diameter increase was gradual and capillary distensibility decreased with increasing pressure (the venular segment showed the most prominent reduction in distensibility). These findings suggest the existence of a longitudinal gradient of distensibility in the capillary compartment.

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          Author and article information

          Journal
          JVR
          J Vasc Res
          10.1159/issn.1018-1172
          Journal of Vascular Research
          S. Karger AG
          1018-1172
          1423-0135
          1989
          1989
          23 September 2008
          : 26
          : 6
          : 325-334
          Affiliations
          Laboratory for Microcirculation, Department of Physiology and Biophysics, SJ-40, University of Washington, Seattle, Wash., USA; Department of Physiology and Biophysics, University of Lund, Sweden
          Article
          158783 Blood Vessels 1989;26:325–334
          10.1159/000158783
          2b87df82-24ca-44ec-a7db-d8681327af8b
          © 1989 S. Karger AG, Basel

          Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

          History
          : 31 July 1989
          : 13 December 1989
          Page count
          Pages: 10
          Categories
          Research Paper

          General medicine,Neurology,Cardiovascular Medicine,Internal medicine,Nephrology
          Capillary distensibility,Intraluminal pressure,Gradient of distensibility,Capillary diameter

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