AIPMT MAIN2008Zoology-Nervous System
AIPMT MAIN 2008 Zoology Nerve Impulse MCQ Question
Type: MCQ-conceptual-Medium-Class 11
During the propagation of a nerve impulse, the action potential results from the movement of
A
Na⁺ ions from extracellular fluid to intracellular fluid
B
K⁺ ions from extracellular fluid to intracellular fluid
C
Na⁺ ions from intracellular fluid to extracellular fluid
D
K⁺ ions from intracellular fluid to extracellular fluid
Correct Answer
Option A
Detailed Explanation
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 from extracellular fluid to intracellular fluid, generating an action potential.
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