| Effects of afferent input on the breathing pattern continuum in the tambaqui (Colossoma macropomum). | |
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MedLine Citation:
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PMID: 12809797 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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This study used a decerebrate and artificially-ventilated preparation to examine the roles of various afferent inputs in breathing pattern formation in the tambaqui (Colossoma macropomum). Three general breathing patterns were observed: (1) regular breathing; (2) frequency cycling and (3) episodic breathing. Under normoxic, normocapnic conditions, 50% of control fish exhibited regular continuous breathing and 50% exhibited frequency cycling. Denervation of the gills and oro-branchial cavity promoted frequency cycling. Central denervation of the glossopharyngeal and vagus nerves produced episodic breathing. Regardless of the denervation state, hyperoxia produced either frequency cycling or episodic breathing while hypoxia and hypercarbia shifted the pattern to frequency cycling and continuous breathing. We suggest that these breathing patterns represent a continuum from continuous to episodic breathing with waxing and waning occupying an intermediate stage. The data further suggest that breathing pattern is influenced by both specific afferent input from chemoreceptors and generalised afferent input while chemoreceptors specific for producing changes in breathing pattern may exist in fish. |
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Authors:
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Stephen G Reid; Lena Sundin; Luis Henrique Florindo; Francisco Tadeu Rantin; William K Milsom |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Respiratory physiology & neurobiology Volume: 136 ISSN: 1569-9048 ISO Abbreviation: Respir Physiol Neurobiol Publication Date: 2003 Jun |
Date Detail:
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Created Date: 2003-06-17 Completed Date: 2003-10-06 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 101140022 Medline TA: Respir Physiol Neurobiol Country: Netherlands |
Other Details:
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Languages: eng Pagination: 39-53 Citation Subset: IM |
Affiliation:
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Department of Life Sciences, University of Toronto at Scarborough, 1265 Military Trail, Toronto, Ont., Canada M1C 1A4. sgreid@utsc.utoronto.ca |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Afferent Pathways
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physiology* Animals Anoxia / physiopathology Carbon Dioxide / pharmacology Decerebrate State / physiopathology* Denervation / methods Fishes Heart-Assist Devices Hypercapnia / physiopathology Hyperoxia / physiopathology Oxygen / pharmacology Peripheral Nerves / physiology Pulmonary Ventilation / physiology Respiration* Respiratory Physiological Phenomena* |
| Chemical | |
Reg. No./Substance:
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124-38-9/Carbon Dioxide; 7782-44-7/Oxygen |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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