Q. When a neuron is in resting state, $i.e.,$ not conducting any impulse, the axonal membrane is
A) Equally permeable to both $Na^{+}\ and\ K^{+}$ ions
B) Impermeable to both $Na^{+}\ and\ K^{+}\ ions$
C) Comparatively more permeable to $K^{+}$ ions and nearly impermeable to $Na^{+}$ ions
D) Comparatively more permeable to $Na^{+}$ ions and nearly impermeable to $K^{+}$ ions
Explanation
Neurons are excitable cells because their membrane are in a polarized state. Different types of selectively permeable channels are present on the neural membrane. When a neuron is not conducting any impulse, $i.e.,$ resting, the axonal membrane is comparatively more permeable to potassium ion ($K^{+}$) and nearly impermeable to sodium ion ($Na^{+}$).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.