Abstract
The present study was undertaken to examine cardiac responses to some of the temperature challenges that eels encounter in their natural environment. The contractile properties of ventricular muscle was studied on electrically paced tissue strips after long term acclimation at 0 °C, 10 °C, or 20 °C, and following acute ± 10 °C temperature changes. The time-course of contraction, and thus maximal attainable heart rates, was greatly influenced by working temperature, but was independent of acclimation history. The absolute force of contraction and power production (i.e. the product of force and stimulation frequency) was significantly influenced by acute temperature decrease from 20 °C to 10 °C. The role of adrenaline as a modulator of contraction force, power production, rates of contraction and relaxation, and minimum time in contraction was assessed. Increased adrenergic tonus elicited a positive inotropic, temperature-dependent response, but did not influence twitch duration. This suggests that adrenaline acts as an agent in maintaining an adequate contractile force following temperature challenges. A significant increased relative ventricular mass was observed in 0 °C and 10 °C-acclimated eels compared to 20 °C-acclimated, w...Continue Reading
References
Feb 1, 1986·Cell Calcium·J W Putney
May 8, 2000·The Journal of Experimental Zoology·J R BaileyW R Driedzic
Feb 15, 2001·Proceedings of the National Academy of Sciences of the United States of America·S H Woo, M Morad
Apr 17, 2001·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·E Aho, M Vornanen
Jan 24, 2002·Nature·Donald M Bers
Jul 4, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Holly A ShielsAnthony P Farrell
Jul 4, 2002·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Matti VornanenAnthony P Farrell
Feb 28, 2004·Physiological and Biochemical Zoology : PBZ·H A ShielsA P Farrell
Jan 20, 2006·American Journal of Physiology. Cell Physiology·Jingbo HuangGlen F Tibbits
Dec 5, 2006·The Journal of Experimental Biology·S ImbrognoM C Cerra
Sep 4, 2009·Proceedings. Biological Sciences·F GarofaloS Imbrogno
Sep 26, 2009·Science·Kim AarestrupRobert S McKinley
Citations
Oct 1, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Julie LarsenRichard Brill
Aug 10, 2020·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·A T Goulding, A P Farrell
Oct 4, 2020·Scientific Reports·P VezzaP S Kemp
Sep 6, 2013·The Journal of Experimental Biology·Sandra Imbrogno