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Keywords: Blood pressure
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Journal Articles
J Exp Biol (2021) 224 (17): jeb242202.
Published: 13 September 2021
... positive chronotropic effects. To investigate whether this tonic elevation of heart rate impairs the ability for autonomic regulation of heart during digestion, we characterised heart rate responses to pharmacological manipulation of blood pressure in the snake Boa constrictor through serial injections...
Journal Articles
J Exp Biol (2020) 223 (8): jeb219501.
Published: 23 April 2020
... response was identified in terms of a faster return of heart rate to baseline values during the recovery period of the 10th session of restraint. The increase in blood pressure and the decrease in tail skin temperature were similar at the 1st and 10th session of restraint. Exposure to CVS, social isolation...
Journal Articles
J Exp Biol (2020) 223 (2): jeb218164.
Published: 27 January 2020
... differences between splenectomized (unable to release erythrocytes from the spleen) and sham-operated individuals, we demonstrate the metabolic benefits (i.e. aerobic scope increase of 103%) and the cardiovascular trade-offs (i.e. ventral aortic blood pressure and cardiac workload increase of 12% and 30...
Includes: Supplementary data
Journal Articles
J Exp Biol (2016) 219 (18): 2880–2887.
Published: 15 September 2016
...% in reference fish) and reduced intrinsic cardiac pacemaker rate. A barostatic response was evident in both groups, as pharmacologically induced increases and decreases in blood pressure resulted in atropine-sensitive bradycardia and tachycardia, respectively. Yet, the tachycardia in Biotest fish...
Journal Articles
J Exp Biol (2016) 219 (5): 725–733.
Published: 01 March 2016
...Lucas A. Zena; Valter Dantonio; Luciane H. Gargaglioni; Denis V. Andrade; Augusto S. Abe; Kênia C. Bícego ABSTRACT Baroreflex regulation of blood pressure is important for maintaining appropriate tissue perfusion. Although temperature affects heart rate ( f H ) reflex regulation in some reptiles...
Journal Articles
J Exp Biol (2014) 217 (13): 2232–2234.
Published: 01 July 2014
...Sanne Enok; Christopher Slay; Augusto S. Abe; James W. Hicks; Tobias Wang Interspecific allometric analyses indicate that mean arterial blood pressure (MAP) increases with body mass of snakes and mammals. In snakes, MAP increases in proportion to the increased distance between the heart...
Journal Articles
J Exp Biol (2009) 212 (23): 3919–3927.
Published: 01 December 2009
..., the maximum hyperventilatory effect of PACAP was approximately 2.5-fold higher than the effect of VIP at the 100 pmol dose (PACAP, =+5407±921 arbitrary units, a.u.; VIP, =+2056±874 a.u.; means ± s.e.m.). When injected centrally, only PACAP produced a significant increase in mean dorsal aortic blood pressure...
Journal Articles
J Exp Biol (2008) 211 (22): 3588–3593.
Published: 15 November 2008
... by coronary arteries. The functional importance of these coronary arteries remains unknown. In the present study we investigate the effects of permanent coronary artery occlusion in the South American rattlesnake ( Crotalus durissus ) on the ability to maintain heart rate and blood pressure at rest and during...
Journal Articles
J Exp Biol (2005) 208 (19): 3739–3746.
Published: 01 October 2005
... + Q̇ pul . Heart rate ( f h ) was calculated from the instantaneous blood flow trace from the LAo, and total stroke volume( V s tot ; pulmonary + systemic) was calculated as Q̇ tot / f h . When baseline blood flow changes more than baseline blood pressure, which is the case in most in vivo...
Journal Articles
J Exp Biol (2005) 208 (6): 1095–1107.
Published: 15 March 2005
..., are linked to the initiation of cardiorespiratory responses to hypercarbia. * Author for correspondence (e-mail: Katie.Gilmour@science.uottawa.ca ) 3 1 2005 © The Company of Biologists Limited 2005 2005 tambaqui Colossoma macropomum hypercarbia blood pressure ventilation blood...
Journal Articles
J Exp Biol (2004) 207 (25): 4451–4461.
Published: 01 December 2004
..., we examine the branchial effects of severe hypoxia (<0.3 mg oxygen l –1 for 20 min in anaesthetized epaulette shark), by measuring ventral and dorsal aortic blood pressure ( P VA and P DA ), heart rate ( f h ), and observing gill microcirculation using epi-illumination microscopy. Hypoxia induced...
Journal Articles
J Exp Biol (2004) 207 (9): 1471–1478.
Published: 01 April 2004
...Gina Galli; E. W. Taylor; Tobias Wang SUMMARY Seven freshwater turtles Trachemys scripta were instrumented with flow probes and cannulated for blood pressure measurements. The turtles were warmed from 24 to 34°C, and cooled down to 24°C, with and without atropine. Animals exhibited a hysteresis...
Journal Articles
J Exp Biol (2004) 207 (2): 269–283.
Published: 15 January 2004
...J. A. W. Stecyk; J. Overgaard; A. P. Farrell; T. Wang SUMMARY Anoxic exposure in the anoxia-tolerant freshwater turtle is attended by substantial decreases in heart rate and blood flows, but systemic blood pressure ( P sys ) only decreases marginally due to an increase in systemic peripheral...
Journal Articles
J Exp Biol (2003) 206 (23): 4241–4245.
Published: 01 December 2003
... are well separated by the muscular ridge, and a previous study using in situ perfusion of the heart revealed a remarkable flow separation and showed that the systemic side can sustain higher output pressures than the pulmonary side. Here we extend these observations by showing that systemic blood pressure...
Journal Articles
J Exp Biol (2003) 206 (5): 867–876.
Published: 01 March 2003
... was then microinjected into identified sites within the Xs in an attempt to mimic chemoreceptor- and baroreceptor-induced reflexes commonly observed in fish. By necessity, the brain injections were performed on anaesthetised animals that were fixed by `eye bars' in a recirculating water system. Blood pressure and heart...
Journal Articles
J Exp Biol (2002) 205 (13): 1843–1851.
Published: 01 July 2002
... resistance and thus shunting to be controlled somewhat independently of systemic blood pressure or chronic pulmonary resistance and allows the shunt to be initiated or terminated in, perhaps, a single heart beat. Although we believe that synchronization of RV depolarization with valve contraction...
Journal Articles
J Exp Biol (2001) 204 (20): 3553–3560.
Published: 15 October 2001
... equipped with an arterial catheter for measurements of blood pressure and heart rate, and autonomic tonus was determined following infusion of the β-adrenergic antagonist propranolol (3 mg kg –1 ) and the muscarinic cholinoceptor antagonist atropine (3 mg kg –1 ). The mean heart rate of fasting animals...
Journal Articles
J Exp Biol (1991) 156 (1): 387–398.
Published: 01 March 1991
... lumen and separating the ventral aorta from the diastolic heart. In larger animals (>0.1g) serial flap valves in the conus separated the ventral aorta from the diastolic ventricle, and the conus supported ventral arterial blood pressure because of its elastic properties. Note: Present address...
Journal Articles
J Exp Biol (1990) 151 (1): 297–316.
Published: 01 July 1990
...MICHAEL AXELSSON; ANTHONY P. FARRELL; STEFAN NILSSON Cardiac output, ventral and dorsal aortic blood pressure and heart rate were recorded simultaneously in unanaesthetized hagfish, Myxine glutinosa L. Mean cardiac output was S.Tmlmin -1 kg -1 and mean heart rate 22.3beatsmin -1 . The absence...
Journal Articles
J Exp Biol (1988) 134 (1): 235–246.
Published: 01 January 1988
... a forward bloodflow within the lateral vessel. In the dorsal vessel, the blood pressure was about 0.9-1.9kPa in different animals. The blood flow was discontinuous with velocities of 0.5-10 mms −1 . Average blood flow in the dorsal vessel was 22.9μl min −1 . An improved model of the circulation in the leech...