scholarly journals The Role of Pulmocutaneous Baroreceptors in the Control of Lymphatic Heart Rate in the Toad Bufo Marinus

2000 ◽  
Author(s):  
Dane Crossley II
Keyword(s):  
Heart Rate ◽  
Bufo Marinus ◽  
Lymphatic Heart ◽  
Toad Bufo

scholarly journals The Role of Pulmocutaneous Baroreceptors in the Control of Lymphatic Heart Rate in the Toad Bufo marinus

1999 ◽  
Vol 72 (1) ◽  
pp. 109-115 ◽  
Author(s):  
Dane Alan Crossley II ◽  
Stanley S. Hillman
Keyword(s):  
Heart Rate ◽  
Bufo Marinus ◽  
Lymphatic Heart ◽  
Toad Bufo

The role of hypoglossal sensory feedback during feeding in the marine toad,Bufo marinus

1992 ◽  
Vol 264 (3) ◽  
pp. 245-252 ◽  
Author(s):  
Kiisa C. Nishikawa ◽  
Carl Gans
Keyword(s):  
Sensory Feedback ◽  
Bufo Marinus ◽  
Toad Bufo

The role of hind limb flexor muscles during swimming in the toad, Bufo marinus

Zoology ◽  
2007 ◽  
Vol 110 (1) ◽  
pp. 28-40 ◽  
Author(s):  
Gary B. Gillis
Keyword(s):  
Hind Limb ◽  
Bufo Marinus ◽  
Flexor Muscles ◽  
Toad Bufo

Autonomic influences on heart rate and blood pressure in the toad, Bufo marinus, at rest and during exercise

1988 ◽  
Vol 134 (1) ◽  
pp. 377-396 ◽  
Author(s):  
I. Wahlqvist ◽  
G. Campbell
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Plasma Catecholamines ◽  
Cardiovascular Responses ◽  
Blocking Agent ◽  
Additional Treatment ◽  
Bufo Marinus ◽  
Adrenergic Nerve ◽  
Exercise Period ◽  
Toad Bufo

Blood pressure (PA) and heart rate (HR) were measured in the conscious, resting toad, Bufo marinus. Treatment with bretylium (an adrenergic neurone blocking agent), alone or in combination with phentolamine and propranolol (adrenoceptor antagonists) did not alter PA or HR significantly. Atropine caused a small but significant increase in HR but had no effect on PA. The experiments indicate a cholinergic cardio-inhibitory tone but give no evidence for an adrenergic pressor tone at rest. Treadmill exercise caused a rapid increase in PA and HR which was sustained throughout the exercise period. This response was partly psychogenic. The concentration of plasma catecholamines increased during exercise and was high enough to affect organs that were included in an extracorporeal blood circuit with the exercising animal. Bretylium treatment revealed an initial hypotension, presumably due to work hyperaemia, followed by a hypertension which was reduced compared to controls. The tachycardia was delayed but HR eventually reached control levels. Additional treatment with phentolamine and propranolol did not further affect the PA response, but significantly reduced the tachycardia reached during exercise. It is concluded that the cardiovascular responses to exercise involve adrenergic nerve fibres causing hypertension and an initial rapid tachycardia. Circulating catecholamines seem to be the major cause of the sustained tachycardia.

Baroreceptor control of heart rate in the conscious toad Bufo marinus

1981 ◽  
Vol 241 (5) ◽  
pp. R307-R311
Author(s):  
D. G. Smith ◽  
P. J. Berger ◽  
B. K. Evans
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Mean Arterial Pressure ◽  
Arterial Pressure ◽  
Bufo Marinus ◽  
Carotid Circulation ◽  
Normalized Gain ◽  
Toad Bufo

Perivascular balloons were used to elicit heart rate (HR) responses to imposed changes in mean arterial pressure (Pa) in conscious unrestrained toads (Bufo marinus). It is clear that functional baroreceptors lie in the pulmocutaneous arteries of B. marinus, and that these can elicit compensatory heart rate responses to perturbations of blood pressure. Functional baroreceptors were not present in the carotid circulation and are probably absent from the lateral aortae and conus arteriosus as well. Normalized gain of the baroreceptor-heart rate reflex (delta HR%/delta Pa) in five toads was 13%/kPa, which is considerably less than that found in other vertebrates to date.

The Role of the Lymphatic System in Water Balance Processes in the Toad Bufo marinus (L.)

1993 ◽  
Vol 66 (3) ◽  
pp. 307-321 ◽  
Author(s):  
Lee A. Wentzell ◽  
Shelly A. McNeil ◽  
Daniel P. Toews
Keyword(s):  
Water Balance ◽  
Lymphatic System ◽  
Bufo Marinus ◽  
Toad Bufo

The Role of Arginine Vasotocin in the Control of Posterior Lymph Heart Function in the Toad Bufo marinus (L.)

1994 ◽  
Vol 67 (2) ◽  
pp. 515-525 ◽  
Author(s):  
Glenn G. Parsons ◽  
Lee A. Wentzell ◽  
Judy M. Jones ◽  
Daniel P. Toews
Keyword(s):  
Heart Function ◽  
Bufo Marinus ◽  
Arginine Vasotocin ◽  
Lymph Heart ◽  
Toad Bufo

Active transport of calcium across the urinary bladder and colon of the toad Bufo marinus

1983 ◽  
Vol 245 (1) ◽  
pp. R91-R94 ◽  
Author(s):  
C. J. Rosoff ◽  
G. F. Baldwin ◽  
P. J. Bentley
Keyword(s):  
Urinary Bladder ◽  
Active Transport ◽  
Bufo Marinus ◽  
Calcium Flux ◽  
Metabolic Inhibitors ◽  
Net Flux ◽  
Calcium Exchange ◽  
Toad Bufo

Unidirectional fluxes of calcium were measured (in vitro) across the urinary bladder and colon of the toad Bufo marinus in the absence of electrochemical gradients. A net calcium flux was observed in each tissue, but the polarity differed; it occurred from the mucosal (luminal) to the serosal side of the colon and from the serosal to mucosal (urinary) side of the bladder. The active transport in each tissue appeared to involve different mechanisms; that across the colon exhibited a sodium dependence, possibly involving a sodium-calcium exchange, but this was not seen in the urinary bladder. The net flux in the latter was, however, abolished by metabolic inhibitors, possibly reflecting a role of a calcium-adenosine triphosphatase mechanism. The results are discussed in relation to the calcium metabolism of this amphibian.

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