... 22H04827 23KJ0080 Heart reversal Cardiac muscle Chordate Oscillator Tunicate Ascidian Summary: Pulsation waves traveling along the heart tube of the ascidian Ciona robusta intermittently reverse due to autonomous and periodical changes in the beating frequencies of a pair of terminal...

... oxygen affinity, respiratory flux control and excess capacity of cytochrome c oxidase . J. Exp. Biol.   201 , 1129 - 1139 . Hansen , C. A. and Sidell , B. D. ( 1983 ). Atlantic hagfish cardiac muscle: metabolic basis of tolerance to anoxia . Am. J. Physiol.   244 , R356 - R362...

... cooled from 35 to 15°C. We measured heart ventricle mass, an indicator of O 2 delivery capacity, and mitochondrial respiration in permeabilized skeletal and cardiac muscle to elucidate associated changes in mitochondrial capacities at the cellular level. We examined animals on day 24 of incubation...

... Cardiac muscle Temperature The thermal sensitivity of aerobic scope is important in determining the vulnerability of organisms to environmental change ( Pörtner and Knust, 2007 ; Nilsson et al., 2009 ; Eliason et al., 2011 ). At suboptimal temperatures, limitations in oxygen transport reduce...

... activities. However, because cardiac muscle is perfused during dives, it may rely less heavily on Mb, β and anaerobic pathways to support contractile activity. In addition, because cardiac tissue must sustain contractile activity even before birth, it may be more physiologically mature at birth...

... cardiac muscle lobster For the neurogenic decapod crustacean heart the burst rate and intra-burst spike frequency of the intrinsic cardiac ganglion determines, in the first instance, heart rate and beat amplitude, respectively( Hallett, 1970 ; Van der Kloot, 1970 ; Anderson and Cooke, 1971...

... with a molecular mass of 130 kDa. It exhibits 77.5-80.9% identity at the mRNA level and 85.3-86.9% identity at the protein level with PMCA3 from human, mouse and rat. Membrane topography was typical of published mammalian PMCAs. Northern blot analysis of total RNA from crayfish gill, antennal gland,cardiac muscle...

... endothermy metabolic biochemistry locomotor muscle cardiac muscle aerobic capacity anaerobic capacity temperature citrate synthase creatine phosphokinase lactate dehydrogenase Recent works have documented the high degree of evolutionary convergence between sharks in the family Lamnidae...

...C. J. Barclay; C. Widén; L. J. Mellors SUMMARY The aim of this study was to determine whether the initial mechanical efficiency (ratio of work output to initial metabolic cost) of isolated cardiac muscle is over 60%, as has been reported previously, or whether it is approximately 30%, as suggested...

... pressure cardiac muscle heart shunt left aorta pulmonary artery right ventricle electrocardiogram cog-wheel valve conduction velocity nodal delay The crocodilian ventricle is unique among reptiles because it is morphologically divided into left and right halves by a complete...

...Claire L. Harwood; Iain S. Young; John D. Altringham SUMMARY Different species of animals require different cardiac performance and, in turn, their cardiac muscle exhibits different properties. A comparative approach can reveal a great deal about the mechanisms underlying myocardial contraction...

...L. J. Mellors; C. J. Barclay SUMMARY Studies of cardiac muscle energetics have traditionally used contraction protocols with strain patterns that bear little resemblance to those observed in vivo . This study aimed to develop a realistic strain protocol, based on published in situ measurements...

... efficiency heat production enthalpy output work loop series elastic compliance cardiac muscle rat Many investigations of ventricular energetics have used isolated papillary muscles as a model of ventricular muscle. These muscles have myocytes arranged in parallel along their length, can...

.... * Author for correspondence (e-mail: [email protected] ) 9 2 2000 23 4 2000 © 2000 by Company of Biologists 2000 myoglobin mRNA Antarctic fish Channichthyidae Nototheniidae heart cardiac muscle mRNA Low temperatures and high oxygen solubility characterize...

... quantified ultrastructural features and enzymatic indices of metabolic capacity in cardiac muscle from Gobionotothen gibberifrons , which expresses both Hb and Mb, Chionodraco rastrospinosus , which lacks Hb but expresses Mb, and Chaenocephalus aceratus , which lacks both Hb and Mb. The most striking...

... 2000 by Company of Biologists 2000 hypometabolism skeletal muscle cardiac muscle ion channel arrest hibernation frog Rana temporaria Na + /K + -ATPase homeostasis When frogs ( Rana temporaria ) are denied access to air at 3 °C, to mimic the conditions of an ice-covered pond...

...Kenneth J. Rodnick; John R. Bailey; Jenny L. West; Alison Rideout; William R. Driedzic ABSTRACT We investigated the effects of anoxia and contractile activity on glucose uptake and the intracellular location of hexokinase in cardiac muscle of the American eel Anguilla rostrata . Uptake of 2...

... in muscle stiffness and the increase in net energy loss over this range of lengths. The physiological significance of the length–work relationship is considered and the mechanical properties of active and passive papillary muscles are discussed with reference to sarcomere length and cardiac muscle...

... be separated from more general effects on cardiac performance (e.g. series VI), thus permitting comment on the mechanism of lactate transport into cardiac muscle. lodoacetic acid (0.5 mmol l -1 ) effectively blocks glycolytic metabolism in a number of perfused heart preparations (e.g. rat, rabbit...

...Winsor H. Watson, III; Toshinori Hoshi; John Colburne; George J. Augustine ABSTRACT The responses of Limulus cardiac neuromuscular junctions and cardiac muscle cells to four endogenous amines were determined in order to identify the cellular targets underlying amine modulation of heartbeat...