Which of These Events Must Occur First to Trigger the Skeletal

question 66

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) binds to receptors on the sarcolemma and allows passage of sodium ions into the cell.
• C) Potassium ions diffuse out of the muscle cell.
• D) The sodium-potassium pump restores sodium and potassium back to their initial positions.
• E) Acetylcholinesterase (AchE) breaks down acetylcholine (ACh).

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