The responses of resistance vessels of the intestine and kidney were induced by high amplitude impulses (over 15 muV), while those of capacitance vessels in these organs were induced by low amplitude impulses (15 muV and lower) of postganglionic sympathetic fibres.
Constrictory responses of splenic resistance vessels arising under pressor reflexes were abolished by hexonium (2 mg/kg) as well as the high amplitude (above 15 muV) impulses in sympathetic splenic nerves. Constrictory and dilatory responses of splenic capacitance vessels were preserved after administration of the same dose of hexonium and correlated as to the directivity with the changes of the low amplitude (15 muV and lower) impulsation in the splenic nerve.
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