When the threshold stimulus is applied, the permeability of the membrane for sodium ions will change. Voltage gated sodium ion channels open and Na+ion flows form extracellular fluid to intracellular fluid, the outside becomes negative and inside positive. The membrane is depolarised & when the two ends of this membrane is connected to oscilloscope a potential difference of +30mv, called as action potential is generated.
During the propagation of a nerve impulse, the action potential results from the movement of
NEET UG 2008 — Zoology Neural Control and Coordination
2008mcqeasy
During the propagation of a nerve impulse, the action potential results from the movement of
Official previous-year question
Held on 30 Apr 2008 · Verified 9 Jul 2026.
Options
- A
Na+ions from extracellular fluid to intracellular fluid
- B
Ka+ions from extracellular fluid to intracellular fluid
- C
Na+ions from intracellular fluid to extracellular fluid
- D
Ka+ions from intracellular fluid to extracellular fluid
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