Neuromuscular Junction Quiz

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Questions and Answers

What causes synaptic vesicles to fuse with the axonal membrane at the neuromuscular junction?

  • Entry of Ca2+ into the axon terminal (correct)
  • Binding of ACh to its receptors
  • Release of acetylcholine (ACh)
  • Initiation of electrical changes in the sarcolemma

What prevents continued muscle fiber contraction at the neuromuscular junction?

  • Binding of ACh to its receptors
  • Release of acetylcholine (ACh) into the synaptic cleft
  • Initiation of electrical changes in the sarcolemma
  • Destruction of acetylcholine by acetylcholinesterase (correct)

What initiates electrical changes in the sarcolemma at the neuromuscular junction?

  • Binding of ACh to its receptors (correct)
  • Voltage-regulated calcium channels opening
  • Entry of Ca2+ into the axon terminal
  • Release of acetylcholine (ACh)

What diffuses across the synaptic cleft to ACh receptors on the junction folds of the sarcolemma?

<p>Acetylcholine (ACh) (A)</p> Signup and view all the answers

What causes synaptic vesicles to release acetylcholine (ACh) into the synaptic cleft?

<p>Fusion with the axonal membrane (B)</p> Signup and view all the answers

What allows Ca2+ to enter the axon terminal at the neuromuscular junction?

<p>Voltage-regulated calcium channels (A)</p> Signup and view all the answers

What enzyme is responsible for the destruction of acetylcholine at the neuromuscular junction?

<p>Acetylcholinesterase (D)</p> Signup and view all the answers

What initiates electrical changes in the sarcolemma at the neuromuscular junction?

<p>Binding of acetylcholine to its receptors (D)</p> Signup and view all the answers

What diffuses across the synaptic cleft to ACh receptors on the junction folds of the sarcolemma at the neuromuscular junction?

<p>Acetylcholine (B)</p> Signup and view all the answers

What causes synaptic vesicles to fuse with the axonal membrane at the neuromuscular junction?

<p>Ca2+ inside the axon terminal (A)</p> Signup and view all the answers

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