Control of diving responses by carotid bodies and baroreceptors in ducks
- 1 January 1982
- journal article
- research article
- Published by American Physiological Society in American Journal of Physiology-Regulatory, Integrative and Comparative Physiology
- Vol. 242 (1), R105-R108
- https://doi.org/10.1152/ajpregu.1982.242.1.r105
Abstract
The precise role of carotid body chemoreceptors and systemic baroreceptors in cardiovascular responses during experimental diving in ducks is controversial. The diving responses of chronically baroreceptor-denervated, chemoreceptor-denervated, and combined baroreceptor- and chemoreceptor-denervated White Pekin ducks, A. platyrhynchos, were compared with those of intact and sham-operated birds. All 3 types of denervation elevated predive heart rates on average by 100-150 beats/min. During submergence, the cardiac rate of the barodenervates quickly dropped and after 60 s stabilized at levels similar to those of submerged intact ducks for the remainder of a 2-min dive. Arterial blood pressure declined drastically in the barodenervates. Ducks without functional carotid bodies showed significant bradycardia during submergence, although heart rate only fell to the predive rate of intact animals. Birds with combined baroreceptor and chemoreceptor denervation exhibited the same degree of bradycardia as chemoreceptor denervates, and arterial blood pressure rose spectacularly during a dive. During experimental diving in ducks cardiac responses are not baroreflexive in origin, the major portion of bradycardia is due to stimulation of carotid body chemoreceptors, and intact systemic baroreceptors appear essential for maintenance of blood pressure.This publication has 8 references indexed in Scilit:
- Effect of cardiovascular variables on hyperpnea during recovery from diving in ducksJournal of Applied Physiology, 1982
- Cardiac receptors in ducks: the effect of their stimulation and blockade on diving bradycardiaAmerican Journal of Physiology-Regulatory, Integrative and Comparative Physiology, 1980
- Depressed baroreceptor-cardiac reflex sensitivity during simulated diving in ducksComparative Biochemistry and Physiology Part A: Physiology, 1980
- EVIDENCE FOR A CENTRAL ACTION OF CO2 VENTILATORY STIMULUS IN PEKIN DUCKS1979
- Role of the arterial chemoreceptors in ventilatory and circulatory adjustments to hypoxia in awake Pekin ducksJournal of Comparative Physiology B, 1979
- Arterial baroreceptor reflexes in the seal and their modification during experimental divesAmerican Journal of Physiology-Heart and Circulatory Physiology, 1978
- The Initial Cardiovascular Responses in the Diving DuckActa Physiologica Scandinavica, 1975
- The Role of the Cardiovascular Response in the Resistance to Asphyxia of Avian DiversActa Physiologica Scandinavica, 1963