<prompt> Gamma efferent system is involved inTendon reflexClonusMuscle toneAll of the above  <response>: D All of the above Motor neurons of y efferent system are regulated to a large degree by descending tracts from a number of areas in the brain. Golgi tendon organs, are stimulated by both passive stretch and active contraction of the muscle. The muscles are generally hypotonic when the rate of y efferent discharge is low and hypertonic when it is high. Increased y efferent discharge is present is inclonus Ankle clonus is atypical example. 