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The respiratory consequences of feeding in amphibians and reptiles.
The studies on cardiorespiratory responses to digestion may allow for a further understanding of the physiological and structural constraints that limits the ability of reptiles and amphibians to sustain high metabolic rates. Expand
Ventilation and gas exchange in lizards during treadmill exercise.
Because minute ventilation increased more than did oxygen consumption, an increase in lung PO2 during exercise is predicted and, thus, Varanus exanthematicus appears effectively to ventilate its lungs to match the increased metabolic rate during locomotion at moderate speed. Expand
Autonomic control of heart rate during forced activity and digestion in the snake Boa constrictor.
It appears that some other factor exerts a positive chronotropic effect during digestion, and it is proposed that this factor may be a circulating regulatory peptide, possibly liberated from the gastrointestinal system in response to the presence of food. Expand
Cardiorespiratory synchrony in turtles.
  • T. Wang, J. Hicks
  • Biology, Medicine
  • The Journal of experimental biology
  • 1 August 1996
This study confirms cardiorespiratory synchrony in the turtle Trachemys scripta but, in contrast to earlier studies, a net right-to-left cardiac shunt prevailed regardless of ventilatory state. Expand
Respiratory consequences of feeding in the snake Python molorus.
The small changes in plasma [HCO3-] and stable pH show that pythons respond very differently to digestion than alligators where very large alkaline tides have been observed, and it seems worthwhile to describe arterial blood gases during digestion in other species of ectothermic vertebrates. Expand
Patterns of cardiovascular and ventilatory response to elevated metabolic states in the lizard Varanus exanthematicus.
The results indicate that, in these lizards, the cardiac response to elevated vdot (O2) is stereotyped, the response being predictable irrespective of the source of the metabolic increment. Expand
Hypoxia elicits an increase in pulmonary vasculature resistance in anaesthetised turtles (Trachemys scripta).
It is demonstrated that turtles exhibit hypoxic pulmonary vasoconstriction, although the threshold is low compared with that of mammals. Expand
Cardiovascular Regulation during Anoxia in the Turtle: An In Vivo Study
In contrast, injection of atropine during anoxia resulted in an increase in the heart rate and systemic blood flow, suggesting that the anoxic cardiac response is partially mediated through cholinergic mechanisms. Expand
Cardiorespiratory responses of the toad (Bufo marinus) to hypoxia at two different temperatures.
The present study shows that the cardiac right-to-left shunt that prevails in undisturbed and resting toads is reduced with increased temperature and during hypoxia, consistent with the general view that the cardiorespiratory shunt is regulated and reduced whenever oxygen delivery is compromised or metabolic rate is increased. Expand
Effects of feeding on metabolism, gas transport, and acid-base balance in the bullfrog Rana catesbeiana.
Bullfrogs partly submerged in water were fed meals amounting to approximately (1)/(10) of their body weight, and there was no sign of anaerobic energy production during digestion as plasma and tissue lactate levels remained low and intracellular ATP concentration stayed high. Expand