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Related Experiment Videos

A decrease in nasal CO2 stimulates breathing in the tegu lizard.

E L Coates1, R A Furilla, G O Ballam

  • 1Dartmouth Medical School, Department of Physiology, Hanover, New Hampshire 03756.

Respiration Physiology
|October 11, 1991
PubMed
Summary
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Tegu lizards

Area of Science:

  • Comparative physiology
  • Respiratory regulation
  • Chemosensation

Background:

  • Nasal chemoreceptors in reptiles are sensitive to carbon dioxide (CO2).
  • Constant nasal CO2 reduces ventilatory frequency (f) in tegu lizards.
  • Pulsed nasal CO2 during exhalation does not affect f.

Purpose of the Study:

  • Investigate the effect of nasal CO2 pattern on ventilatory frequency (f) in tegu lizards.
  • Determine if CO2 delivered during inspiration affects f.
  • Assess if pulsed decreases in nasal CO2 can reverse CO2-induced f inhibition.

Main Methods:

  • Ventilation measured using pneumotachography and pressure transducer.
  • CO2 delivered to nasal cavities via tubes in external nares.
  • Tested effects of pulsed inspiratory CO2 and CO2 drops during breathing.

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Main Results:

  • Pulsed inspiratory 4% CO2 did not alter ventilatory frequency (f).
  • Decreasing nasal CO2 from 4% to 0% stimulated breathing.
  • Drops from 4% to 0% or 4% to 2% showed no significant difference in f response.

Conclusions:

  • Nasal CO2 receptors in tegu lizards do not regulate breathing breath-by-breath.
  • Receptors distinguish between pulsed and constant CO2 delivery.
  • Phasic CO2 stimulation during inspiration does not affect f.