| Whole-body systemic transcapillary filtration rates, coefficients, and isogravimetric capillary pressures in Bufo marinus and Rana catesbeiana. | |
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MedLine Citation:
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PMID: 10801394 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Whole-body and organ-level transcapillary filtration rates and coefficients are virtually unexamined in ectothermal vertebrates. These filtration rates appear to be greater than in mammals when plasma volume shifts and lymphatic function are analyzed. Gravimetric techniques monitoring whole-body mass changes were used to estimate net systemic filtration in Bufo marinus and Rana catesbeiana while perfusing with low-protein Ringer's and manipulating venous pressure. Capillary pressures were estimated from arterial and venous pressures after measuring the venous to arterial resistance ratio of 0.23. The capillary filtration coefficient (CFC) for the two species was 25.2+/-1.47 mL min-1 kg-1 kPa-1. Isogravimetric capillary pressure (Pci), the pressure at which net fluid is neither filtered nor reabsorbed, was 1.12+/-0.054 kPa and was confirmed by an independent method. None of these variables showed a significant interspecific difference. The anuran CFC and Pci are significantly higher than those found using the same method on rats (7.6+/-2.04 mL min-1 kg-1 kPa-1 and 0.3+/-0.37 kPa, respectively) and those commonly reported in mammals. Despite the high CFC, the high Pci predicts that little net filtration will occur at resting in vivo capillary pressures. |
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Authors:
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T V Hancock; T M Hoagland; S S Hillman |
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Publication Detail:
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Type: Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Physiological and biochemical zoology : PBZ Volume: 73 ISSN: 1522-2152 ISO Abbreviation: Physiol. Biochem. Zool. Publication Date: 2000 Mar-Apr |
Date Detail:
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Created Date: 2000-07-06 Completed Date: 2000-07-06 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100883369 Medline TA: Physiol Biochem Zool Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 161-8 Citation Subset: IM |
Affiliation:
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Environement, Population, and Organismic Biology, University of Colorado, Boulder, CO 80309-0334, USA. hancockt@colorado.edu. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blood Pressure Bufo marinus / physiology* Capillaries / physiology* Capillary Permeability / physiology* Epinephrine / physiology Female Histamine / physiology Isotonic Solutions Male Perfusion / veterinary Rana catesbeiana / physiology* Rats Rats, Sprague-Dawley Serum Albumin, Bovine / physiology Transducers / veterinary Vasoconstrictor Agents |
| Chemical | |
Reg. No./Substance:
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0/Isotonic Solutions; 0/Serum Albumin, Bovine; 0/Vasoconstrictor Agents; 51-43-4/Epinephrine; 51-45-6/Histamine; 8026-10-6/Ringer's solution |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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