Which is the true statement about the synapses in the spinal cord in the stretch reflex?
sensory nuerons synapse with motor nuerons interneurons to excite the extrafusal fibers of the stretched muscle
internuerons make inhibitory synapses with neurons that prevent contraction of the antagonist muscle
the antagonist muscle is activated by increased frequency stimuli
polysynaptic intemeurons first synapse with higher brain centers