Which of the following statements about the motor system is true
a. the medial motor tracts are associated with dexterous movements
b. a drug that inhibits acetylcholinesterase, the enzyme that degrades acetylcholine, would inhibit muscle contraction
c. stretch of the sensory dendrites within the muscle spindle result in opening of mechanically-gated sodium channels, depolarizing the sensory neuron
d. intrafusal fibers are responsible for the majority of the muscle's contraction
Ans: c. stretch of the sensory dendrites within the muscle spindle result in opening of mechanically-gated sodium channels, depolarizing the sensory neuron
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