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Temperature and central chemoreceptor drive to ventilation in toad (Bufo paracnemis)
L G Branco1, M L Glass, T Wang
1Department of Physiology, Faculty of Medicine of Ribeiräo Preto, University of São Paulo, Brazil.
Respiration Physiology
|September 1, 1993
Summary
The central chemoreceptor drive to ventilation in toads increases with temperature. This suggests temperature proportionally affects the ventilatory response to changes in acid-base status.
Area of Science:
- Physiology
- Comparative Physiology
- Respiratory Physiology
Background:
- The central chemoreceptor system is crucial for regulating ventilation.
- Temperature significantly influences physiological processes, including respiration.
Purpose of the Study:
- To investigate the effect of temperature on central chemoreceptor drive to ventilation in unanesthetized toads.
- To assess the role of temperature in ventilatory control of acid-base status.
Main Methods:
- Unanesthetized toads (Bufo paracnemis) were exposed to 15, 25, and 35°C.
- Ventilation was measured using pneumotachography.
- Acid-base status was manipulated via mock cerebrospinal fluid (CSF) perfusion and hypercapnic gas mixtures, with arterial blood gases analyzed.
Main Results:
- Central chemoreceptor drive predominantly controlled acid-base status regardless of temperature.
- Ventilatory response to chemoreceptor stimulation (lowered mock CSF pH or hypercapnia) increased proportionally with temperature.
- The alphastat hypothesis did not fully explain temperature-dependent ventilatory responses.
Conclusions:
- Temperature proportionally modulates the ventilatory response to central chemoreceptor stimulation in toads.
- Central chemoreceptors play a key role in maintaining acid-base balance across different temperatures.
- Findings challenge the applicability of the alphastat hypothesis in this context.