The first channels to open are the sodium ion channels, which allow sodium ions to enter the cell. The resulting increase in positive charge inside the cell (up to about +40 mV ) starts the action potential. This is called the depolarization of the membrane. Potassium ion channels Related Theory Events that characterize the transmission of a nerve impulse. (Ref. to Fig. 25.7) 
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric…
NEET UG 2007 — Zoology Neural Control and Coordination
2007mcqmedium
During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric change?
Official previous-year question
Held on 30 Apr 2007 · Verified 9 Jul 2026.
Options
- A
first positive, then negative and continue to be negative
- B
first negative, then positive and continue to be positive
- C
first positive, then negative and again back to positive
- D
first negative, then positive and again back to negative.
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