Cost of ventilation and effect of digestive state on the ventilatory response of the tegu lizard

Respiratory Physiology & Neurobiology
Nini Skovgaard, Tobias Wang

Abstract

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.

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Citations

Jul 4, 2008·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Stephen M Secor
Sep 29, 2011·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Daniel W Baker, Colin J Brauner
Oct 28, 2009·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Jessamyn S Markley, David R Carrier
Jun 10, 2009·Respiratory Physiology & Neurobiology·Angelina Y FongWilliam K Milsom
Jun 15, 2007·Respiratory Physiology & Neurobiology·Nini Skovgaard, Tobias Wang
Nov 3, 2015·Respiratory Physiology & Neurobiology·Stella Y Lee, William K Milsom
Aug 20, 2015·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Joanna PiercyWilliam K Milsom
Dec 24, 2014·Respiratory Physiology & Neurobiology·Tábata E F CordeiroWilfried Klein
Feb 21, 2016·The Journal of Experimental Biology·Nini SkovgaardTobias Wang
Jun 18, 2005·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Nini SkovgaardTobias Wang
Dec 20, 2014·The Journal of Experimental Biology·Michelle N ReichertWilliam K Milsom
Sep 14, 2012·The Journal of Experimental Biology·Suzanne L Munns
Oct 6, 2009·The Journal of Experimental Biology·Catalina Reyes, William K Milsom
Nov 11, 2019·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Livia M DuranCleo A C Leite

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