Pressure and heart rate responses to raised carotid pressure in the toad

Neither transient nor steady occlusion of the bilateral carotid arterial trunks had noticeable effects on blood pressure or heart rate of the toad Bufo arenarum Hensel. Distension of isolated carotid labyrints had no circulatory effects, whereas distension of unisolated carotid trunks by fluid infus...

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Autor principal: Segura, E.T.
Formato: JOUR
Materias:
animal experiment
blood pressure
cardiovascular system
carotid artery pressure
carotid sinus pressoreceptor
heart
heart rate
tachycardia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_03636135_v6_n6_pH639_Segura
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_03636135_v6_n6_pH639_Segura
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spelling todo:paper_03636135_v6_n6_pH639_Segura2023-10-03T15:27:30Z Pressure and heart rate responses to raised carotid pressure in the toad Segura, E.T. animal experiment blood pressure cardiovascular system carotid artery pressure carotid sinus pressoreceptor heart heart rate tachycardia Neither transient nor steady occlusion of the bilateral carotid arterial trunks had noticeable effects on blood pressure or heart rate of the toad Bufo arenarum Hensel. Distension of isolated carotid labyrints had no circulatory effects, whereas distension of unisolated carotid trunks by fluid infusion caused an increase in blood pressure proportional to the applied pressure. A simultaneous tachycardia was recorded. These circulatory effects seem to depend on the venous return to the heart because carotid distension was followed by a proportional rise in right atrial pressure. Consequently infusion of small volumes of saline into the right atrium also promoted tachycardia and hypertension. These responses seem not to depend on central nervous mechanisms because they persisted after complete deafferentation or removal of the bulbomesencephalic centers. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_03636135_v6_n6_pH639_Segura
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic animal experiment
blood pressure
cardiovascular system
carotid artery pressure
carotid sinus pressoreceptor
heart
heart rate
tachycardia
spellingShingle animal experiment
blood pressure
cardiovascular system
carotid artery pressure
carotid sinus pressoreceptor
heart
heart rate
tachycardia
Segura, E.T.
Pressure and heart rate responses to raised carotid pressure in the toad
topic_facet animal experiment
blood pressure
cardiovascular system
carotid artery pressure
carotid sinus pressoreceptor
heart
heart rate
tachycardia
description Neither transient nor steady occlusion of the bilateral carotid arterial trunks had noticeable effects on blood pressure or heart rate of the toad Bufo arenarum Hensel. Distension of isolated carotid labyrints had no circulatory effects, whereas distension of unisolated carotid trunks by fluid infusion caused an increase in blood pressure proportional to the applied pressure. A simultaneous tachycardia was recorded. These circulatory effects seem to depend on the venous return to the heart because carotid distension was followed by a proportional rise in right atrial pressure. Consequently infusion of small volumes of saline into the right atrium also promoted tachycardia and hypertension. These responses seem not to depend on central nervous mechanisms because they persisted after complete deafferentation or removal of the bulbomesencephalic centers.
format JOUR
author Segura, E.T.
author_facet Segura, E.T.
author_sort Segura, E.T.
title Pressure and heart rate responses to raised carotid pressure in the toad
title_short Pressure and heart rate responses to raised carotid pressure in the toad
title_full Pressure and heart rate responses to raised carotid pressure in the toad
title_fullStr Pressure and heart rate responses to raised carotid pressure in the toad
title_full_unstemmed Pressure and heart rate responses to raised carotid pressure in the toad
title_sort pressure and heart rate responses to raised carotid pressure in the toad
url http://hdl.handle.net/20.500.12110/paper_03636135_v6_n6_pH639_Segura
work_keys_str_mv AT seguraet pressureandheartrateresponsestoraisedcarotidpressureinthetoad
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