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An experiment is conducted on a spinal frog. The time of defense flexor reflex decreased from 10 sec. to 6 sec. after increasing the area of the skin surface, which is acted on with acid solution. What mechanism underlies the diminishing of the time of defense flexor reflex?Irradiation of excitation on divergent nervous chains.Spatial summation of excitation.Temporal summation of excitation.Principle of dominant.Recirculation of excitation.
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