Why Is There a Sudden Large Influx of Calcium Ions

question 43

Multiple Choice

Why is there a sudden large influx of calcium ions into a nerve terminal when the membrane potential repolarizes from a strong depolarization back to resting membrane potential?

• A) The driving force for calcium entry is increased.
• B) The driving force for calcium entry is decreased.
• C) Calcium channels are opened by the repolarization.
• D) Calcium channels are closed by the repolarization.
• E) There is no change in the driving force for calcium entry.

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