Which option indicates correct chronology of changes occurring during transmission of nerve impulse?

Question

Which option indicates correct chronology of changes occurring during transmission of nerve impulse?

1. A. Nerve fibre - depolarization - action potential - repolarization - activation of Na+ and K+ pump (Correct answer)
2. B. Nerve fibre - depolarization - action potential - activation of Na+ and K+ pump - repolarization
3. C. Nerve fiber - depolarization - repolarization - action potential - activation of Na+ and K+ pump
4. D. Nerve fiber - Activation of Na+ and K+ pump - depolarization - repolarization

Correct Answer

Option A — Nerve fibre - depolarization - action potential - repolarization - activation of Na+ and K+ pump

Detailed Solution & Explanation

The correct answer is Nerve fibre - depolarization - action potential - repolarization - activation of Na+ and K+ pump.

Key Points

• The correct sequence: nerve fiber at rest -> depolarization (Na+ influx) -> action potential -> repolarization (K+ efflux) -> Na+/K+ pump restores resting potential.