Baroreflex sensitivity in an amphibian, rana catesbeiana, and a reptilian, Pseudemys scripta elegans

The Journal of Experimental Zoology
R W Millard, R Moalli

Abstract

An inverse relationship between heart rate and systematic arterial pressure is demonstrated in unanesthetized bullfrogs (Rana catesbeiana) and red-eared turtles (Pseudemys scripta elegans). Drug-induced elevation of systemic blood pressure resulted in proportional decreases in heart rate and lengthening of the pulse interval. Conversely, nitroglycerin-induced decreases in blood pressure produced compensatory increases in heart rate. This relationship in frogs is defined by y = 25.4x + 1684, and in turtles by y = 64.8x + 1686, where y is pulse interval in msec and x is systolic blood pressure in mmHg. Resting and drug-induced systolic pressure limits were not different in the two species. However, both resting and reflexly altered heart rates were significantly lower in turtles than in frogs (p < .05). The heart rate responses were abolished by atropinization, without effect on the blood pressure responses. While anatomic identification of the baroreceptor site sensing the pressure changes remains to be made, the translation of pressure information via reflex pathways analogous to mammalian baroreceptor reflex arc system is evidenced in these lower vertebrates.

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Citations

May 8, 2000·The Journal of Experimental Zoology·D A CrossleyJ Altimiras
May 1, 1985·Biological Reviews of the Cambridge Philosophical Society·R J Bagshaw
Apr 7, 2010·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Mette K HagensenTobias Wang
Dec 3, 2014·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Michael S HedrickDane A Crossley
Sep 30, 2014·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Lucas A ZenaKênia C Bícego
Apr 7, 2015·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Michael S HedrickDane A Crossley
May 1, 2016·The Veterinary Clinics of North America. Exotic Animal Practice·Brian K Roberts
Nov 24, 1999·The American Journal of Physiology·B N van Vliet, J P Montani
Aug 25, 2021·The Journal of Experimental Biology·Tobias WangEdwin W Taylor

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