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ilikepie1234 ilikepie1234
wrote...
11 years ago
Acetylcholine is a neurotransmitter that transmits a signal from a nerve cell to a muscle cell, causing the muscle to contract. How is the neurotransmitter inactivated so that the muscle can relax?

  a. acid    
  b. it diffuses away    
  c. it is hydrolyzed by pepsin    
  d. it is hydrolyzed by acetylcholinesterase    
  e. it is replaced by succinylcholine
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wrote...
11 years ago
The answer is "d", it is hyddrolyzed by acetylcholinesterase to produce choline + acetate.  The acetate diffuses away, but the choline is taken back up by the nerve terminal that released it.
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