Botulinum toxin impairs muscle contraction by acting on proteins that anchor vesicles in the presynaptic membrane.The toxin has medical uses.Given its effects at the neuromuscular junction, botulinum could be used to treat all of the following except
A) eyelid twitches.
B) jaw clenching.
C) facial tics.
D) flaccid arm and leg muscles.
E) muscle spasms of cerebral palsy.

Question

Quizplus · Accepted Answer

Botulinum toxin impairs muscle contraction, leading to muscle paralysis. Therefore, it would not be useful in treating flaccid arm and leg muscles, which are already weak and paralyzed. It would be more useful in treating conditions involving muscle overactivity, such as eyelid twitches, jaw clenching, and facial tics. It can also be used in the treatment of muscle spasms caused by cerebral palsy.

Botulinum Toxin Impairs Muscle Contraction by Acting on Proteins That