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

question 16

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 i.e., after all of the others) ?

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

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