Question

Explain the following: Role of Na+ in the generation of action potential.

Answer 1

Sodium ions play an important role in the generation of action potential. When a nerve fibre is stimulated, the membrane potential decreases. The membrane becomes more permeable to Na+ ions than to K+ ions. As a result, Na+ diffuses from the outside to the inside of the membrane. This causes the inside of the membrane to become positively-charged, while the outer membrane gains a negatively charge. This reversal of polarity across the membrane is known as depolarisation. The rapid inflow of Na+ ions causes the membrane potential to increase, thereby generating an action potential.

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Answer 2

Answer:

Sodium ions play a very important role within the generation of nerve impulse. once a nerve fiber is stimulated, the membrane potential decreases.

The membrane becomes additional permeable to Na+ ions than to K+ ions. As a result, Na+ diffuses from the surface to the inside of the membrane.

This causes the inside of the membrane to become positively-charged, whereas the outer membrane gains a negatively charge. This reversal of polarity across the membrane is thought as depolarization.

The fast flow of Na+ ions causes the membrane potential to extend, thereby generating an action potential.