All of the following decrease skeletal muscle tone by CNS effects except____________?

Correct answer: A. D-tubocurarin

  • A. D-tubocurarin
  • B. Diazepam
  • C. Beclofen
  • D. Mephensin

Explanation

D-tubocurarine produces skeletal muscle relaxation by blocking nicotinic receptors at the neuromuscular junction, which is a peripheral action rather than a CNS effect. Diazepam, baclofen and mephenesin reduce muscle tone through central mechanisms.

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