Abstract
An acute change in physiological temperature can have a significant impact on heart function in fish, and as a result, the delivery of blood to the tissues. A decrease in temperature causes a reduction in the rate of pacemaker firing, an increase in action potential duration, and a decrease in the sensitivity of the myofilaments to Ca2+. Comparatively, an increase in physiological temperature can increase the rate of pacemaker firing, decrease the duration of action potential duration and increase the sensitivity of the myofilaments to Ca2+. These direct effects of temperature on cardiac function can be reduced as a result of adrenergic stimulation. However, too much of an increase in temperature can cause the heart to effectively stop working. As fish approach this temperature (upper lethal temperature) the counter movement of Na+ and K+ across the myocyte membrane becomes imbalanced, and this can lead to cardiac arrhythmias and the collapse of heart function.
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