Renato Filogonio
Federal University of São Carlos
EndocrinologyCardiac outputBlood flowHypercarbiaBiology
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Publications 10
#1Warren W. Burggren (UNT: University of North Texas)H-Index: 46
#2Renato Filogonio (UFSCar: Federal University of São Carlos)H-Index: 4
Last. Tobias Wang (AU: Aarhus University)H-Index: 33
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This review explores the long-standing question: 'Why do cardiovascular shunts occur?' An historical perspective is provided on previous research into cardiac shunts in vertebrates that continues to shape current views. Cardiac shunts and when they occur is then described for vertebrates. Nearly 20 different functional reasons have been proposed as specific causes of shunts, ranging from energy conservation to improved gas exchange, and including a plethora of functions related to thermoregulati...
#1Renato Filogonio (UFSCar: Federal University of São Carlos)H-Index: 4
#2Karina F. Orsolini (UFSCar: Federal University of São Carlos)
Last. Cleo A. C. Leite (UFSCar: Federal University of São Carlos)H-Index: 14
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#1Renato Filogonio (UFSCar: Federal University of São Carlos)H-Index: 4
#2Dane A. Crossley (UNT: University of North Texas)H-Index: 19
Abstract Reptilian embryos often face challenging environmental gas compositions during incubation, which may inflict long-lasting effects in the individuals' physiological responses. These conditions can have a lasting effect on the animal into juvenile life as chronic prenatal exposure to hypercarbia results in enlarged hatchling organ size, higher growth rate and resting metabolic rate, although relatively smaller increment in metabolic scope during digestion. Therefore, we wanted to verify w...
#1Bastiaan J. Boukens (UvA: University of Amsterdam)H-Index: 17
#2Ditte L. Kristensen (AU: Aarhus University)H-Index: 1
Last. Bjarke Jensen (UvA: University of Amsterdam)H-Index: 16
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Abstract The electrocardiogram (ECG) reveals that heart chamber activation and repolarization are much faster in mammals and birds compared to ectothermic vertebrates of similar size. Temperature, however, affects electrophysiology of the heart and most data from ectotherms are determined at body temperatures lower than those of mammals and birds. The present manuscript is a review of the effects of temperature on intervals in the ECG of ectothermic and endothermic vertebrates rather than a hypo...
5 CitationsSource
#1Dang Diem Tuong (Can Tho University)H-Index: 2
#2Brittney G. Borowiec (McMaster University)H-Index: 3
Last. William K. Milsom (UBC: University of British Columbia)H-Index: 44
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The aim of the present study was to determine the roles of externally versus internally oriented CO2/H+-sensitive chemoreceptors in promoting cardiorespiratory responses to environmental hypercarbia in the facultative air-breathing fish, Chitala ornata (the clown knifefish). Fish were exposed to environmental acidosis (pH ~ 6.0) or hypercarbia (≈ 30 torr PCO2) that produced changes in water pH equal to the pH levels of the acidotic water to distinguish the relative roles of CO2 versus H+. We als...
2 CitationsSource
#2Renato FilogonioH-Index: 4
Last. Bjarke JensenH-Index: 16
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Abstract As a ubiquitous signaling molecule, nitric oxide (NO) exerts various important effects on the cardiovascular system and is involved in the regulation of vascular tone and myocardial metabolism in vertebrates. Lungfishes are closely related to tetrapods and provide an interesting possibility to understand the transition from water to land. Lungfishes are endowed with both systemic and pulmonary circulations, and their incompletely divided ventricle allows for blood to bypass either circu...
4 CitationsSource
#1Renato Filogonio (USP: University of São Paulo)H-Index: 4
#2Tobias Wang (AU: Aarhus University)H-Index: 33
Last. Cleo A. C. Leite (UFSCar: Federal University of São Carlos)H-Index: 14
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The undivided ventricle of non-crocodilian reptiles allows for intracardiac admixture of oxygen-poor and oxygen-rich blood returning via the atria from the systemic circuit and the lungs. The distribution of blood flow between the systemic and pulmonary circuits may vary, based on differences between systemic and pulmonary vascular conductances. The South American rattlesnake, Crotalus durissus, has a single pulmonary artery, innervated by the left vagus. Activity in this nerve controls pulmonar...
8 CitationsSource
#1Renato FilogonioH-Index: 4
#2Edwin W. TaylorH-Index: 43
Last. Cleo A. C. Leite (UFSCar: Federal University of São Carlos)H-Index: 14
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Estimating total systemic blood flow based on measurements from a single aortic arch is common practice in cardiovascular stud- ies on reptiles to avoid heavy instrumentation and consequent stress responses. This practice requires the validation of a specific correction factor that expresses the relationship between the measured blood flow and the blood flow to be estimated. Misleading estimations may occur when correction factors are used in different conditions from those they were originally ...
4 CitationsSource
#1Renato FilogonioH-Index: 4
Last. Augusto S. AbeH-Index: 7
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We investigate if thermoregulatory patterns of captive broad snouted caiman, Caiman latirostris , changes in response to different thermal situations. We implanted subcutaneous dataloggers on eight adult females and distributed four copper models filled with water to measure operative environmental temperatures exposed to the sun (Ts), at the shadow (Tsh), at the water (Tw) and at the water ponds (Tp) located inside the caiman pen. Maximum Tb correlated inversely to body mass, implying a social ...