Abstract
We showed that dilatation of the limb vessels in response to stimulation of the sympathetic chain occurred more frequently than in the usual experimental set-up if the animal used first served for several hours as a donor in a cross-circulation arrangement. In a considerable number of experiments with such animals, a vasodilator effect occurred in response to all frequencies of stimulation. When stimuli of varying frequency or duration provoked different effects, the dilatation of the vessels was attained only with stimuli of lower frequency and shorter duration than those which caused vasoconstriction.
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