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

question 29

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 release
• B)conformational change in troponin
• C)depolarization of the muscle cell
• D)release of Ca²⁺ from the sarcoplasmic reticulum
• E)binding of actin to myosin

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