Document Detail

Cost of ventilation and effect of digestive state on the ventilatory response of the tegu lizard.
MedLine Citation:
PMID:  15234678     Owner:  NLM     Status:  MEDLINE    
We performed simultaneous measurements of ventilation, oxygen uptake and carbon dioxide production in the South American lizard, Tupinambis merianae, equipped with a mask and maintained at 25 degrees C. Ventilation of resting animals was stimulated by progressive exposure to hypercapnia (2, 4 and 6%) or hypoxia (15, 10, 8 and 6%) in inspired gas mixture. This was carried out in both fasting and digesting animals. The ventilatory response to hypercapnia and hypoxia were affected by digestive state, with a more vigorous ventilatory response in digesting animals compared to fasting animals. Hypoxia doubled total ventilation while hypercapnia led to a four-fold increase in total ventilation both accomplished through an increase in tidal volume. Oxygen uptake remained constant during all hypercapnic exposures while there was an increase during hypoxia. Cost of ventilation was estimated to be 17% during hypoxia but less than 1% during hypercapnia. Our data indicate that ventilation can be greatly elevated at a small energetic cost.
Nini Skovgaard; Tobias Wang
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Respiratory physiology & neurobiology     Volume:  141     ISSN:  1569-9048     ISO Abbreviation:  Respir Physiol Neurobiol     Publication Date:  2004 Jul 
Date Detail:
Created Date:  2004-07-05     Completed Date:  2004-10-05     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  101140022     Medline TA:  Respir Physiol Neurobiol     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  85-97     Citation Subset:  IM    
Department of Zoophysiology, Aarhus University, Building 131, 8000 Aarhus C, Denmark.
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MeSH Terms
Acid-Base Equilibrium / physiology
Anoxia / metabolism*
Digestion / physiology*
Energy Metabolism / physiology*
Fasting / metabolism*
Hypercapnia / metabolism*
Lizards / metabolism*
Oxygen / metabolism
Oxygen Consumption / physiology
Pulmonary Ventilation / physiology*
Reg. No./Substance:

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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