- Does the membrane pacemaker theory of metabolism explain the size dependence of metabolic rate in marine mussels?
Summary: The membrane pacemaker theory of metabolism applies only to systemic functions in the blue mussel Mytilus edulis.
- Heart rate regulation in diving sea lions: the vagus nerve rules
Summary: Review of the literature and heart rate profiles of diving California sea lions emphasizes the dominance of the parasympathetic nervous system in heart rate regulation and the unlikelihood of morbid arrhythmias.
- Autoregulation of cardiac output is overcome by adrenergic stimulation in the anaconda heart
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.
- Cardiac reflexes in a warming world: thermal plasticity of barostatic control and autonomic tones in a temperate fish
Summary: Perch from a chronically warmed ecosystem exhibit profound thermal compensation of resting heart rate through increased cholinergic tone and heightened baroreflex sensitivity; the latter may safeguard tissue perfusion pressure when tissue oxygen demand is elevated by environmental warming.
- Evidence for a role of heme oxygenase-1 in the control of cardiac function in zebrafish (Danio rerio) larvae exposed to hypoxia
Summary: The heme oxygenase-1/carbon monoxide (HO-1/CO) system is found in the developing zebrafish heart and plays an inhibitory role in setting the resting cardiac frequency.
- The effects of hypoxic bradycardia and extracellular HCO3−/CO2 on hypoxic performance in the eel heart
Summary: Bradycardia (slowed heart rate) substantially improves hypoxia tolerance of eel myocardium, but its specific effect is dependent on extracellular bicarbonate and CO2 concentrations.
- Modulation of heart rate response to acute stressors throughout the breeding season in the king penguin Aptenodytes patagonicus
Summary: Acute fight-or-flight stress responses to experimental stressors are modulated according to breeding advancement in the king penguin.
- Generating an in vitro 3D cell culture model from zebrafish larvae for heart research
Summary: Spontaneously beating 3D ‘heart’ structures can be developed in vitro from larval zebrafish using a novel, fast and inexpensive method that could be employed in ecotoxicology and biomedical safety testing.
- Selection for upper thermal tolerance in rainbow trout (Oncorhynchus mykiss Walbaum)
Summary: Rainbow trout in Pemberton Freshwater Research Centre, Western Australia, demonstrated their impressive thermal performance in terms of cardiorespiratory function.