Multiple choice

The action potential in the nerve impulse results from

  1. decrease in -ve charge inside the nerve fibre

  2. increase in +ve charge outside the nerve fibre

  3. opening of voltage gated Na+ channels

  4. activation of Na-K pump
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Action potential is a short-lived fluctuation in membrane potential of the plasma membrane, which is caused by the opening of the voltage gated ion channels that actively moves the ions across the membrane causing the potential difference.

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