...Catalina Reyes; Angelina Y. Fong; Cleo A. C. Leite; Augusto S. Abe; William K. Milsom ABSTRACT Peripheral arterial chemoreceptors monitor the levels of arterial blood gases and adjust ventilation and perfusion to meet metabolic demands. These chemoreceptors are present in all vertebrates studied...

... the ventilatory response to hypotension, indicating a response independent of peripheral chemoreceptors. Although there are previous data showing increased f H baroreflex sensitivity from 15 to 30°C in this species, further increases in temperature (35°C) diminished f H baroreflex gain (40.5±5.62 versus 21.6±4.64...

... I and II, are probably ammonia chemoreceptors that participate in ventilatory modulation in trout. LIST OF ABBREVIATIONS C a O 2 arterial O 2 content f V ventilation rate Hb hemoglobin HEA high environmental ammonia NEC neuroepithelial cell P a CO2...

...Kenneth R. Olson SUMMARY Although all cells are variously affected by oxygen, a few have the responsibility of monitoring oxygen tensions and initiating key homeostatic responses when P O 2 falls to critical levels. These `oxygen-sensing' cells include the chemoreceptors in the gills...

... of branchial gas exchange in late larval stages. * Author for correspondence ( e-mail: [email protected] ). 09 06 1997 ©The Company of Biologists Limited 1997 chemoreceptors gill ventilation hypoxia bullfrog larva Rana catesbeiana Our current understanding...

.... catesbeiana eliminated the initial, quick response of gill ventilation to changes in the of inspired water and to the presence of NaCN in all three developmental groups. These data suggest that O 2 -sensitive chemoreceptors are located on the first gill arch and are responsible for the initial rapid...

... abolished and gill ventilatory responses attenuated. All ventilatory and cardiovascular responses to NaCN were abolished and gill ventilatory responses to NA and A were attenuated in animals following denervation and pseudobranch ablation. These results demonstrate that O 2 -sensitive chemoreceptors...

... , but did not uniformly stimulate ventilation. These results suggest that central chemoreceptors, which mediate cardiovascular or ventilatory reflexes, are absent in Amia . Amia calva fish hypoxia hypercapnia chemoreceptors ventilation Nearly all fish studied to date respond to aquatic...

... with peripheral chemoreceptors. Breathing elevated or reduced levels of oxygen in the air before diving had no effect on the dive:pre-dive heart rate relationship up to 5 s submergence ( Furilla & Jones, 1986 ). So, although chemoreceptors undoubtedly influence heart rate in longer dives ( Butler & Woakes...

...G. M. Barnas; R. E. Burger ABSTRACT The importance of intrapulmonary chemoreceptors (IPC), sensitive to in the lung, in the control of ventilatory movements is yet to be demonstrated in the self-ventilating bird. We distinguished between the effects of on IPC and on extrapulmonary CO 2 -sensitive...