Chemoreceptors
Mostrando 1-12 de 219 artigos, teses e dissertações.
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1. Hemodynamic and ventilatory response to different levels of hypoxia and hypercapnia in carotid body-denervated rats
OBJECTIVE: Chemoreceptors play an important role in the autonomic modulation of circulatory and ventilatory responses to changes in arterial O2 and/or CO2. However, studies evaluating hemodynamic responses to hypoxia and hypercapnia in rats have shown inconsistent results. Our aim was to evaluate hemodynamic and respiratory responses to different levels of h
Clinics. Publicado em: 2013
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2. Central chemoreceptors and neural mechanisms of cardiorespiratory control
The arterial partial pressure (P CO2) of carbon dioxide is virtually constant because of the close match between the metabolic production of this gas and its excretion via breathing. Blood gas homeostasis does not rely solely on changes in lung ventilation, but also to a considerable extent on circulatory adjustments that regulate the transport of CO2 from i
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-09
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3. Hypercarbic cardiorespiratory reflexes in the facultative air-breathing fish jeju (Hoplerythrinus unitaeniatus): the role of branchial CO2 chemoreceptors.
The aim of the present study was determine the roles that externally versus internally oriented CO2/H+ - sensitive chemoreceptors might play in promoting cardiorespiratory responses to environmental hypercarbia in the air-breathing fish.
The Journal of Experimental Biology. Publicado em: 2011
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4. Hypoxic cardiorespiratory reflexes in the facultative air-breathing fish jeju (Hoplerythrinus uniataeniatus): role of branchial O2 chemoreceptors.
Experimental animals. Animal preparation. Denervation of cranial nerves IX (glossopharyngeal and X (vagus). Experimental protocol.
Journal of Comparative Physiology. B. Publicado em: 2011
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5. Control of respiration in fish, amphibians and reptiles
Fish and amphibians utilise a suction/force pump to ventilate gills or lungs, with the respiratory muscles innervated by cranial nerves, while reptiles have a thoracic, aspiratory pump innervated by spinal nerves. However, fish can recruit a hypobranchial pump for active jaw occlusion during hypoxia, using feeding muscles innervated by anterior spinal nerves
Brazilian Journal of Medical and Biological Research. Publicado em: 2010-05
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6. Integrated Cardio-Respiratory Mechanisms within the brainstem: Involvement of the Caudal Pressor Area, the Nucleus of the Solitary Tract and the Retrotrapezopid Nucleus. / Mecanismos Cardio-Respiratórios Integrados na Região Bulbar: Participação da Área Pressora Caudal, dos Núcleos do Trato Solitário e do Núcleo Retrotrapezóide.
Cardiovascular responses are integrated at different levels of the central nervous system (CNS). In the brainstem, there are different areas related to the cardiovascular control. It is well known that in the ventrolateral medulla there are, at least, three important regions involved with cardiovascular control: the rostral ventrolateral medulla (RVLM), the
Publicado em: 2009
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7. Caracterização dos quimiorreceptores de O2 envolvidos no controle dos reflexos cardio-respiratórios de trairão, Hoplias lacerdae (Teleostei, Erythrinidae) em resposta à hipóxia ambiental
The ability to sense and respond to oxygen availability in the environment is of extreme functional importance for fish. This is even more so in tropical freshwater habitats where environmental hypoxia can occur rapidly in space and time. Recent physiological studies on the cardio-respiratory response of tropical fishes have focused on hypoxia tolerant speci
Publicado em: 2008
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8. Estudo da neurotransmissão do quimiorreflexo e do barorreflexo na área A5 de ratos não anestesiados
The circulatory system is essential for the maintenance of body homeostasis. Neural regulation of the cardiovascular system involves the activation of several groups of peripheral sensors that generates the information to central nervous system, with consequent modulation of the autonomic nervous system. Among the peripheral sensors the arterial baroreceptor
Publicado em: 2007
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9. Participação dos Quimiorreceptores Carotídeos sobre a Regulação Cardiovascular em Ratos Desnutridos
A large number of people die each year due to the intricate aftermath caused by cardiovascular diseases, such as arterial hypertension. Several experimental models have been developed in order to disclose the mechanisms that result in chronic increase of arterial pressure and malnutrition seams to be one of the factors contributing to this pathology. Our lab
Publicado em: 2006
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10. Analysis of antenal sensilla patterns of Rhodnius prolixus from Colombia and Venezuela
Antennal sensilla patterns were used to analyze population variation of domestic Rhodnius prolixus from six departments and states representing three biogeographical regions of Colombia and Venezuela. Discriminant analysis of the patterns of mechanoreceptors and of three types of chemoreceptors on the pedicel and flagellar segments showed clear differentiati
Memórias do Instituto Oswaldo Cruz. Publicado em: 2005-12
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11. Chemoreflex modulation by hypoxia and hypercapnia through submaximal exercise in heart failure patients / "Modulação do quimioreflexo por hipóxia e hipercapnia durante exercício submáximo na insuficiência cardíaca"
Heart failure(HF) dyspnea is complex with potential enrolment of central(CC) and peripheric chemoreceptors(PC).We investigated CC and CP behavior through submaximal exercise in 15 HF patients and 7 normal subjects in treadmill 6-minute cardiopulmonary walking tests:isocapnic hypoxia(HPO), hypercapnia hyperoxic(HCP) and room air.HPO increased:ventilation(VE)
Publicado em: 2005
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12. Changes associated with laboratory rearing in antennal sensilla patterns of Triatoma infestans, Rhodnius prolixus, and Rhodnius pallescens (Hemiptera, Reduviidae, Triatominae)
We examined changes in the array of antennal sensilla of three species of Triatominae (Triatoma infestans, Rhodnius prolixus, and R. pallescens) following their establishment for different periods in laboratory culture. In each case, the laboratory colonies were compared with conspecific samples taken directly from the field, by quantitative analysis of the
Memórias do Instituto Oswaldo Cruz. Publicado em: 2004-02