Q. When a neuron is in resting state i.e. not conducting any impulse, the axonal membrane is
A) Comparatively more permeable to K⁺ ions and nearly impermeable to Na⁺ ions
B) Comparatively more permeable to Na⁺ ions and nearly impermeable to K⁺ ions
C) Equally permeable to both Na⁺ and K⁺ ions
D) Impermeable to both Na⁺ and K⁺ ions
Explanation
[Solution from source] At rest the axonal membrane is far more permeable to K⁺ ions than to Na⁺ ions and nearly impermeable to negatively charged proteins. With the Na⁺/K⁺ pump, this keeps the inside negative, giving the resting potential. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.