Comparative Vertebrate Physiology Control of Respiration in Aquatic and Terrestrial vertebrates.

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Comparative Vertebrate Physiology Control of Respiration in Aquatic and Terrestrial vertebrates

Alveolar ventilation rate AVR = frequency x tidal volume (breaths/min.) (ml/breath) Human AVR = L (12 x )

Alveolar ventilation Which variable enhances AVR more? Tidal volume

Medulla control Pre-Bötzinger complex, parafacial respiratory group (amphibians, mammals)

Hering-Breuer reflex

Chemoreceptors Early detection Central (brain) Peripheral (other areas)

Gases in the environment Aquatic Fluctuations in pO 2 : hypoxia Terrestrial Fluctuations in pCO 2 : hypercapnia

Reptiles and birds

Mammals