Document Detail

Respiratory responses of ducks to simulated altitude.
MedLine Citation:
PMID:  882727     Owner:  NLM     Status:  MEDLINE    
Domestic ducks were exposed to simulated altitudes of 0, 3000, 6000, and 9000 m in order to study the respiratory changes that take place. We found that the respiratory minute volume (VE,BTPS) increased with altitude, the increase being due to increased respiratory frequency while tidal volume (VT, BTPS) showed only minor changes. The quantity of air moved (VE, STPD), however, remained nearly unchanged with increasing altitude. The oxygen extraction, calculated as 1--(FIN2FEO2)/(FEN2FIO2), remained constant at about 0.28 up to 6000 m and declined to 0.17 at 9000 m. The fractional gas concentrations (FO2 and FCO2) in exhaled air and in the interclavicular and posterior thoracic air sacs changed only little up to 6000 m, but at 9000 m FO2 increased and FCO2 decreased. The relative constancy of expired and air sac gas up to 6000 m seems remarkable. However, when applied to current models of air flow in the avian respiratory system the results seem fully explainable and permit a detailed analysis of the functioning of the avian respiratory system.
J M Colacino; D H Hector; K Schmidt-Nielsen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Respiration physiology     Volume:  29     ISSN:  0034-5687     ISO Abbreviation:  Respir Physiol     Publication Date:  1977 May 
Date Detail:
Created Date:  1977-09-17     Completed Date:  1977-09-17     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0047142     Medline TA:  Respir Physiol     Country:  NETHERLANDS    
Other Details:
Languages:  eng     Pagination:  265-81     Citation Subset:  IM; S    
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MeSH Terms
Adaptation, Physiological*
Air Sacs / physiology*
Atmosphere Exposure Chambers
Carbon Dioxide
Ducks / physiology*
Expiratory Reserve Volume
Tidal Volume
Reg. No./Substance:
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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