Blood pressure control in the antarctic fish Pagothenia borchgrevinki
The mechanisms of cardiovascular control in the Antarctic fish Pagothenia borchgrevinki were investigated during rest and swimming exercise using pharmacological tools to reveal the nature of the control systems involved. Simultaneous and continuous recordings of ventral and dorsal aortic blood pres...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.499.2198 2023-05-15T14:02:35+02:00 Blood pressure control in the antarctic fish Pagothenia borchgrevinki Michael Axelsson Bill Davison Malcolm Forster The Pennsylvania State University CiteSeerX Archives 1994 application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.2198 http://jeb.biologists.org/content/190/1/265.full.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.2198 http://jeb.biologists.org/content/190/1/265.full.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://jeb.biologists.org/content/190/1/265.full.pdf text 1994 ftciteseerx 2016-01-08T08:57:06Z The mechanisms of cardiovascular control in the Antarctic fish Pagothenia borchgrevinki were investigated during rest and swimming exercise using pharmacological tools to reveal the nature of the control systems involved. Simultaneous and continuous recordings of ventral and dorsal aortic blood pressure, heart rate and ventral aortic blood flow (cardiac output) were made using standard cannulation procedures and a single-crystal Doppler flowmeter. Exercise produced a clear and consistent decrease in dorsal aortic blood pressure caused by a decrease in systemic vascular resistance. At the same time, ventral aortic blood pressure increased owing to the combined effects of a markedly increased cardiac output (by about 80 %) and branchial vasoconstriction. Judged from the effects of the a-adrenoceptor antagonist prazosin, control of the branchial vasculature involves an a-adrenoceptor-mediated vasoconstriction, in addition to more traditional cholinergic vasoconstrictor and b-adrenoceptor-mediated dilatory mechanisms. The range of heart rates is large, from 3–4 beats min21 in individual fish during hypertensive bradycardia to about 28 beats min21 after atropine treatment. Both Text Antarc* Antarctic Unknown Antarctic The Antarctic |
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ftciteseerx |
language |
English |
description |
The mechanisms of cardiovascular control in the Antarctic fish Pagothenia borchgrevinki were investigated during rest and swimming exercise using pharmacological tools to reveal the nature of the control systems involved. Simultaneous and continuous recordings of ventral and dorsal aortic blood pressure, heart rate and ventral aortic blood flow (cardiac output) were made using standard cannulation procedures and a single-crystal Doppler flowmeter. Exercise produced a clear and consistent decrease in dorsal aortic blood pressure caused by a decrease in systemic vascular resistance. At the same time, ventral aortic blood pressure increased owing to the combined effects of a markedly increased cardiac output (by about 80 %) and branchial vasoconstriction. Judged from the effects of the a-adrenoceptor antagonist prazosin, control of the branchial vasculature involves an a-adrenoceptor-mediated vasoconstriction, in addition to more traditional cholinergic vasoconstrictor and b-adrenoceptor-mediated dilatory mechanisms. The range of heart rates is large, from 3–4 beats min21 in individual fish during hypertensive bradycardia to about 28 beats min21 after atropine treatment. Both |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Michael Axelsson Bill Davison Malcolm Forster |
spellingShingle |
Michael Axelsson Bill Davison Malcolm Forster Blood pressure control in the antarctic fish Pagothenia borchgrevinki |
author_facet |
Michael Axelsson Bill Davison Malcolm Forster |
author_sort |
Michael Axelsson |
title |
Blood pressure control in the antarctic fish Pagothenia borchgrevinki |
title_short |
Blood pressure control in the antarctic fish Pagothenia borchgrevinki |
title_full |
Blood pressure control in the antarctic fish Pagothenia borchgrevinki |
title_fullStr |
Blood pressure control in the antarctic fish Pagothenia borchgrevinki |
title_full_unstemmed |
Blood pressure control in the antarctic fish Pagothenia borchgrevinki |
title_sort |
blood pressure control in the antarctic fish pagothenia borchgrevinki |
publishDate |
1994 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.2198 http://jeb.biologists.org/content/190/1/265.full.pdf |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
http://jeb.biologists.org/content/190/1/265.full.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.499.2198 http://jeb.biologists.org/content/190/1/265.full.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766272904252620800 |