When an Action Potential from a Motor Neuron Arrives at the Neuromuscular

question 23

Multiple Choice

When an action potential from a motor neuron arrives at the neuromuscular junction (NMJ) , a series of events occurs that leads to muscle contraction. Which of the following events will occur last (that is, after all of the others) ?

• A) acetylcholine (ACh) release
• B) action potential propagation down the T tubules
• C) conformational change in troponin
• D) depolarization of the muscle cell
• E) release of Ca2+ from the sarcoplasmic reticulum

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