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Questions and Answers
Which of the following is NOT a component of the neuromuscular junction?
Which of the following is NOT a component of the neuromuscular junction?
- Myofibrils (correct)
- Synaptic vesicles
- Acetylcholine
- Calcium ions
What is the role of acetylcholinesterase in the neuromuscular junction?
What is the role of acetylcholinesterase in the neuromuscular junction?
- To stimulate the motor end plate
- To contract the muscle fiber
- To release acetylcholine into the synaptic cleft
- To break down acetylcholine and terminate its action (correct)
What happens when calcium ions are released into the neuromuscular junction?
What happens when calcium ions are released into the neuromuscular junction?
- They inhibit the action of acetylcholinesterase
- They depolarize the motor end plate
- They trigger the release of acetylcholine from the synaptic vesicles
- They bind to troponin, causing a conformational change (correct)
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Study Notes
Neuromuscular Junction Components
- The neuromuscular junction consists of a motor neuron, muscle fiber, and the synapse between them.
Acetylcholinesterase Role
- Acetylcholinesterase breaks down acetylcholine into choline and acetate, terminating the neural signal transmission at the neuromuscular junction.
Calcium Ion Release
- When calcium ions are released into the neuromuscular junction, they facilitate the fusion of acetylcholine-containing synaptic vesicles with the nerve terminal, allowing acetylcholine release into the synapse.
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