Which of the Following Is the Sequence of Ion Movements

question 272

Multiple Choice

Which of the following is the sequence of ion movements that causes an action potential?

• A) Sodium ions move into the axon, and then potassium ions move out of the axon.
• B) Sodium ions move out of the axon, and then potassium ions move into the dendrite.
• C) Potassium ions move out of the dendrite, and then sodium ions move into the axon.
• D) Sodium ions move out of the axon, and then potassium ions move into the axon.

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