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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Dominance

The power or influence one entity has over others, often seen in social, economic, or ecological contexts.

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Commitments often made by individuals, particularly teenagers, to abstain from sex until marriage.

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A social and cultural concept often defined as the state of having never engaged in sexual intercourse.

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