Which of These Events Must Occur First to Trigger the Skeletal

question 31

Multiple Choice

Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract?

• A) sodium ions rush into the cell
• B) acetylcholine (ACh) causes temporary permeability to sodium
• C) diffusion of potassium ions out of the cell
• D) operation of the sodium-potassium pump
• E) acetylcholinesterase (AchE) breaks down acetylcholine (ACh)

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