An Action Potential from a Motor Neuron Arriving at the Neuromuscular

question 60

Multiple Choice

An action potential from a motor neuron arriving at the neuromuscular junction (NMJ) triggers a series of events leading to muscle contraction. Of the following four events, which occurs after the others?

• A) acetylcholine (ACh) release
• B) the myosin-binding sites on actin are exposed
• C) depolarization of the muscle cell
• D) release of Ca2+ from the sarcoplasmic reticulum

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