Muscles have which efferent nerve fibers for regulating tone?: (A) a-neuron, (B) Gamma neuron, (C) Beta neuron, (D) Delta neuron
Answer is B. Ans. is 'b' i.e., Gamma neuron(Ref: Ganong 23'd/e p.158-162; Guyton 12n/e p. 657)Muscle tone is maintained by stretch reflex through muscle spindles (intrafusal fibers).