Autonomic control of heart rate is virtually independent of temperature but seems related to the neuroanatomy of the efferent vagal supply to the heart in the bullfrog, Lithobathes catesbeianus
Bullfrogs, Lithobathes catesbeianus, bearing a femoral artery cannula were held at 3 temperatures (10, 20 and 30°C) for 24h. Changes in heart rate were recorded before and after injection of cholinergic and adrenergic antagonists. Normal heart rate doubled for each temperature increment. Adrenergic...
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| Published in: | Journal of thermal biology Vol. 37; no. 3; pp. 243 - 247 |
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| Abstract | Bullfrogs, Lithobathes catesbeianus, bearing a femoral artery cannula were held at 3 temperatures (10, 20 and 30°C) for 24h. Changes in heart rate were recorded before and after injection of cholinergic and adrenergic antagonists. Normal heart rate doubled for each temperature increment. Adrenergic tone on the heart varied around 20% at all 3 temperatures but cholinergic tone increased from −5% to 10% between 10 and 30°C. In contrast, cholinergic tone increased from 75% at 5°C to 329% at 25°C in Xenopus laevis. Injection of the neural tracer True Blue into the cervical vagus of the bullfrog revealed a single location for vagal preganglionic neurons (VPN) in the dorsal vagal motor nucleus (DVN), while Xenopus had 30% of its VPN in a ventro-lateral group outside the DVN. Broader comparative studies have suggested that differences in the extent of vagal tone may relate to the location of VPN in the brainstem and this may be the case in these amphibians. |
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| AbstractList | Bullfrogs, Lithobathes catesbeianus, bearing a femoral artery cannula were held at 3 temperatures (10, 20 and 30 degree C) for 24 h. Changes in heart rate were recorded before and after injection of cholinergic and adrenergic antagonists. Normal heart rate doubled for each temperature increment. Adrenergic tone on the heart varied around 20% at all 3 temperatures but cholinergic tone increased from -5% to 10% between 10 and 30 degree C. In contrast, cholinergic tone increased from 75% at 5 degree C to 329% at 25 degree C in Xenopus laevis. Injection of the neural tracer True Blue into the cervical vagus of the bullfrog revealed a single location for vagal preganglionic neurons (VPN) in the dorsal vagal motor nucleus (DVN), while Xenopus had 30% of its VPN in a ventro-lateral group outside the DVN. Broader comparative studies have suggested that differences in the extent of vagal tone may relate to the location of VPN in the brainstem and this may be the case in these amphibians. Bullfrogs, Lithobathes catesbeianus, bearing a femoral artery cannula were held at 3 temperatures (10, 20 and 30°C) for 24h. Changes in heart rate were recorded before and after injection of cholinergic and adrenergic antagonists. Normal heart rate doubled for each temperature increment. Adrenergic tone on the heart varied around 20% at all 3 temperatures but cholinergic tone increased from −5% to 10% between 10 and 30°C. In contrast, cholinergic tone increased from 75% at 5°C to 329% at 25°C in Xenopus laevis. Injection of the neural tracer True Blue into the cervical vagus of the bullfrog revealed a single location for vagal preganglionic neurons (VPN) in the dorsal vagal motor nucleus (DVN), while Xenopus had 30% of its VPN in a ventro-lateral group outside the DVN. Broader comparative studies have suggested that differences in the extent of vagal tone may relate to the location of VPN in the brainstem and this may be the case in these amphibians. |
| Author | Taylor, Edwin W. Sartori, Marina Abe, Augusto S. Leite, Cleo A.C. Skovgaard, Nini de Paula, Gabrielle S. |
| Author_xml | – sequence: 1 givenname: Edwin W. surname: Taylor fullname: Taylor, Edwin W. email: E.W.Taylor@bham.ac.uk organization: Departamento Zoologica, UNESP, Rio Claro, SP, Brazil – sequence: 2 givenname: Nini surname: Skovgaard fullname: Skovgaard, Nini organization: Zoophysiology, Aarhus University, Denmark – sequence: 3 givenname: Cleo A.C. surname: Leite fullname: Leite, Cleo A.C. organization: Departamento Zoologica, UNESP, Rio Claro, SP, Brazil – sequence: 4 givenname: Marina surname: Sartori fullname: Sartori, Marina organization: Departamento Zoologica, UNESP, Rio Claro, SP, Brazil – sequence: 5 givenname: Gabrielle S. surname: de Paula fullname: de Paula, Gabrielle S. organization: Departamento Zoologica, UNESP, Rio Claro, SP, Brazil – sequence: 6 givenname: Augusto S. surname: Abe fullname: Abe, Augusto S. organization: Departamento Zoologica, UNESP, Rio Claro, SP, Brazil |
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| CitedBy_id | crossref_primary_10_1016_j_cbpa_2017_03_019 crossref_primary_10_1016_j_cbpa_2013_03_020 crossref_primary_10_1242_jeb_160911 crossref_primary_10_1016_j_biopsycho_2022_108382 crossref_primary_10_1242_jeb_086199 |
| Cites_doi | 10.1016/S0034-5687(99)00081-X 10.1016/j.biopsycho.2005.11.014 10.1016/j.acthis.2008.11.006 10.1016/S0300-9629(96)00402-1 10.1242/jeb.70.1.57 10.1242/jeb.020529 10.1016/0034-5687(94)00121-F 10.1002/cne.902220304 10.1152/physrev.1999.79.3.855 10.1242/jeb.02278 10.1016/S1095-6433(99)00131-2 10.1016/0300-9629(71)90087-9 10.1111/j.1469-445X.2001.tb00044.x 10.1152/ajpregu.1984.247.5.R884 10.17221/5741-VETMED 10.1016/0306-4565(94)00027-G 10.1590/S0100-879X2010007500044 10.1242/jeb.63.1.117 |
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| Snippet | Bullfrogs, Lithobathes catesbeianus, bearing a femoral artery cannula were held at 3 temperatures (10, 20 and 30°C) for 24h. Changes in heart rate were... Bullfrogs, Lithobathes catesbeianus, bearing a femoral artery cannula were held at 3 temperatures (10, 20 and 30 degree C) for 24 h. Changes in heart rate were... |
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| SubjectTerms | Autonomic control Bullfrog Heart rate Rana catesbeiana Vagal preganglionic neurons Xenopus laevis |
| Title | Autonomic control of heart rate is virtually independent of temperature but seems related to the neuroanatomy of the efferent vagal supply to the heart in the bullfrog, Lithobathes catesbeianus |
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