Multiple choice

During development of action potential in a nerve fibre, why are the positive and negative charges on outer and inner sides of axon membranes reversed?

  1. Due to movement of K+ ions out of the axon.

  2. As more K+ ions enter the axon than Na+ ions leave the same.

  3. As more Na+ ions enter the axon than K+ ions leave the same.

  4. Due to all Na+ ions entering the axon.

  5. Due to high concentration of Cl- ions.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Positive and negative charges on outer and inner sides of axon membranes are reversed as more Na+ ions enter the axon than K+ ions leave the same.