This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Nervous System, Subject name: Physiology
Gamma efferent system is involved in 
Select and explain. 
A. Tendon reflex, B. Clonus, C. Muscle tone, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: (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.