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cardiovascular

  • RESEARCH ARTICLE
    Hemodynamic responses to warming in euryhaline rainbow trout: implications of the osmo-respiratory compromise
    Daniel Morgenroth, Andreas Ekström, Per Hjelmstedt, Albin Gräns, Michael Axelsson, Erik Sandblom
    Journal of Experimental Biology 2019 222: jeb207522 doi: 10.1242/jeb.207522 Published 5 September 2019

    Summary: Gastrointestinal blood flow of seawater-acclimated fish is fine-tuned to elevate water absorption and maintain osmotic balance during acute temperature increases.

  • RESEARCH ARTICLE
    Activity, not submergence, explains diving heart rates of captive loggerhead sea turtles
    Cassondra L. Williams, Katsufumi Sato, Paul J. Ponganis
    Journal of Experimental Biology 2019 222: jeb200824 doi: 10.1242/jeb.200824 Published 24 April 2019

    Highlighted Article: Heart rates of undisturbed loggerhead sea turtles were not different whether turtles were submerged or out of water. Rather, heart rates changes were driven by turtles' activity level.

  • SHORT COMMUNICATION
    Does the left aorta provide proton-rich blood to the gut when crocodilians digest a meal?
    Justin L. Conner, Janna L. Crossley, Ruth Elsey, Derek Nelson, Tobias Wang, Dane A. Crossley
    Journal of Experimental Biology 2019 222: jeb201079 doi: 10.1242/jeb.201079 Published 1 April 2019

    Summary: Blood in the left aorta of American alligators does not contain elevated PCO2 levels during digestion.

  • RESEARCH ARTICLE
    Convective oxygen transport during development in embryos of the snapping turtle Chelydra serpentina
    Marina R. Sartori, Zachary F. Kohl, Edwin W. Taylor, Augusto S. Abe, Dane A. Crossley II
    Journal of Experimental Biology 2018 221: jeb185967 doi: 10.1242/jeb.185967 Published 24 September 2018

    Summary: Late stage snapping turtle embryos present increased oxygen carrying capacity and decreased cardiac output index and heart rate, which contribute to the reported patterns of turtle whole-egg V̇O2.

  • RESEARCH ARTICLE
    The caval sphincter in cetaceans and its predicted role in controlling venous flow during a dive
    Margo A. Lillie, A. Wayne Vogl, Stephen Raverty, Martin Haulena, William A. McLellan, Garry B. Stenson, Robert E. Shadwick
    Journal of Experimental Biology 2018 221: jeb177212 doi: 10.1242/jeb.177212 Published 7 June 2018

    Summary: Locomotion may generate oscillations in a cetacean's venous system. Instead of using their caval sphincter to protect their heart from associated flow spurts, cetaceans could allow partial collapse of abdominal veins to smooth flow from the inferior vena cava.

  • RESEARCH ARTICLE
    Controlling thoracic pressures in cetaceans during a breath-hold dive: importance of the diaphragm
    Margo A. Lillie, A. Wayne Vogl, Stephen Raverty, Martin Haulena, William A. McLellan, Garry B. Stenson, Robert E. Shadwick
    Journal of Experimental Biology 2017 220: 3464-3477; doi: 10.1242/jeb.162289

    Highlighted Article: Stiffening the cetacean diaphragm may stabilize thoracic pressures during a breath-hold dive but it could also cause pressure problems for some of the arteries.

  • SHORT COMMUNICATION
    Autoregulation of cardiac output is overcome by adrenergic stimulation in the anaconda heart
    William Joyce, Michael Axelsson, Tobias Wang
    Journal of Experimental Biology 2017 220: 336-340; doi: 10.1242/jeb.149237

    Summary: Artificially elevating heart rate reduces stroke volume, leading to cardiac output ‘autoregulation’; adrenergic stimulation is needed to concurrently increase myocardial contractility to maintain stroke volume and increase cardiac output.

  • RESEARCH ARTICLE
    In situ cardiac perfusion reveals interspecific variation of intraventricular flow separation in reptiles
    William Joyce, Michael Axelsson, Jordi Altimiras, Tobias Wang
    Journal of Experimental Biology 2016 219: 2220-2227; doi: 10.1242/jeb.139543

    Summary: Non-crocodilian reptiles have an undivided ventricle, but some (pythons, varanid lizards) robustly separate blood flow, whereas others (turtles, anacondas, bearded dragons) show a large capacity for cardiac shunting.

  • SHORT COMMUNICATIONS
    Anaemia only causes a small reduction in the upper critical temperature of sea bass: is oxygen delivery the limiting factor for tolerance of acute warming in fishes?
    Tobias Wang, Sjannie Lefevre, Nina K. Iversen, Inge Findorf, Rasmus Buchanan, David J. McKenzie
    Journal of Experimental Biology 2014 217: 4275-4278; doi: 10.1242/jeb.104166
  • SHORT COMMUNICATIONS
    Oxygen transport is not compromised at high temperature in pythons
    Dannie Fobian, Johannes Overgaard, Tobias Wang
    Journal of Experimental Biology 2014 217: 3958-3961; doi: 10.1242/jeb.105148

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