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Dynamics of the chronotropic action of the efferent vagus on the heart has been studied in rabbits anesthetized by urethan. The analysis has been carried out in the manner used in the examination of technical control systems. The system of the efferent vagus and cardiac pacemaker was considered...
It was shown in these experiments that the minimum sodium concentration for electrical activity of the frog heart is below 10% if at the same time potassium, calcium and chloride concentrations are reduced. Action potentials with nearly normal amplitude and duration were obtained in an isotonic...
1. Electrical stimulation in the posterior medulla of the unanesthetised rabbit shows diffuse distribution and intermingling of pressor and depressor points. 2. Transverse transections, caudally of the hypothalamus, convert the majority of bulbar pressor responses into depressor reactions. This...
In a comparative investigation of Critical Fusion Frequency (C. F. F.) values of 10 squirrels and 12 hedgehogs, it was shown that the C. F. F. values of a diurnal retina (squirrel) lie between about 30 and higher than 103 per sec., whereas these for a nocturnal retina (hedgehog) are about 30 per...
Dynamic properties of some physiological regulatory mechanisms can be examined in a way that is analogous to methods used in technical systems, i. e. in stimulating the efferent or afferent nerves by pulses the frequency of which is sinusoidally modulated. Such a stimulation represents adequate...
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