The Neuromuscular Junction - Medicine BM5 NLM1

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1. What is denervation hypersensitivity?

  • Spontaneous twitching of motor units due to denervation hypersensitivity
  • Redistribution of ACh receptors away from motor end plates causing reactivity to ACh along the length of the muscle fibre
  • Muscle wasting, loss of contractile protein
  • No voluntary or involuntary muscle contraction, no resting muscle tone and no active resistance to stretch
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Other questions in this quiz

2. Where are the greatest potentials recorded?

  • At the NMJ
  • At the pre-synaptic terminal
  • At the end of the muscle fibre (furthest from the NMJ)
  • In the middle of the muscle fibre

3. Which two substances join to form ACh?

  • Acetyl CoA & Choline
  • Acetic Acid & CoA
  • Acetic Acid & Cholinesterase
  • Acetyl CoA & Citric Acid

4. At the NMJ there are multiple terminal boutons. What is a terminal boutons?

  • The LMN
  • The site of neurotransmitter release
  • The whole motor end plate
  • The vesicles that hold the neurotransmitter in the pre-synaptic membrane

5. True or false: An action potential in the motor neuron will always result in a muscle contraction?

  • 1966
  • False
  • True
  • Pass

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