Q. In the resting state of the neural membrane, diffusion due to concentration gradients, if allowed would drive
A) $K^{+}$ into the cell
B) $K^{+}and\ Na^{+}$ out of the cell
C) $Na^{+}$ into the cell
D) $Na^{+}$ out of the cell
Explanation
In the resting nerve fibre, the cytoplasm inside the axon has a high concentration of $K^{+}$ and a low concentration of $Na^{+}$ in contrast to the fluid outside the axon. Thus, if diffusion occurs then through concentration gradient $Na^{+}$ enters the fibre.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.