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Control of blood pressure mediated by baroreflex changes of heart rate in the chicken embryo (Gallus gallus)
 

Summary: Control of blood pressure mediated by baroreflex changes
of heart rate in the chicken embryo (Gallus gallus)
JORDI ALTIMIRAS AND DANE A. CROSSLEY II
Department of Biological Sciences, University of Nevada Las Vegas,
Las Vegas, Nevada 89154; and Danish Center for Respiratory Adaptation,
Department of Zoophysiology, University of Aarhus, Aarhus 8000, Denmark
Altimiras, Jordi, and Dane A. Crossley II. Control of
blood pressure mediated by baroreflex changes of heart rate
in the chicken embryo (Gallus gallus). Am J Physiol Regula-
tory Integrative Comp Physiol 278: R980­R986, 2000.--
Pharmacological manipulation of peripheral resistance via
sodium nitroprusside and phenylephrine was used to study
baroreflex function over the latter two-thirds of incubation in
embryonic chickens. From day 9 to day 19 of incubation, there
is a positive linear relation between heart rate and blood
pressure, indicating the feedforward action of arterial pres-
sure on heart rate. A reciprocal relationship between blood
pressure and heart rate became pronounced during the last 3
days of incubation. For the purpose of the study, gain of the
baroreflex was calculated as maximal gain (only those em-

  

Source: Altimiras, Jordi - Department of Biology, Linköpings Universitet

 

Collections: Environmental Sciences and Ecology