The Movement of Sodium and Potassium Ions Across the Nerve

Question

The movement of sodium and potassium ions across the nerve cell membrane involves
A)no energy since it involves simple osmotic gradients.
B)simple diffusion.
C)a substantial amount of cell energy to provide active transport.
D)dialysis.
E)neurotransmitters.

Accepted Answer

The movement of sodium and potassium ions across the nerve cell membrane involves active transport, which requires a significant amount of cell energy (in the form of ATP) to move ions against their concentration gradients. This process is essential for generating and propagating nerve impulses. Therefore, option C is the correct choice. Option A and B are incorrect because the movement is not solely due to osmotic gradients or simple diffusion. Option D is not relevant to the process, and option E involves neurotransmitters, which are not directly involved in ion movement across the cell membrane.