Muscle Relaxant Effects of Botulinum Toxin Appear to Diminish or Wear

question 3

Multiple Choice

Muscle relaxant effects of botulinum toxin appear to diminish or wear off after several months because

• A) the immune system destroys the toxin
• B) the muscle hypertrophies and generates more muscle fibers
• C) a new presynaptic terminal "sprouts" from the axon was originally affected by the toxin
• D) the liver metabolizes the toxin
• E) the toxin is excreted intact in the urine

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