Question

What is the equilibrium membrane potential for Na?

1) -70 mV
2) -50 mV
3) 0 mV
4) 50 mV

Answer 1

The equilibrium membrane potential for Na+ is -70 mV.

Step-by-step explanation:

A neuron at rest has a resting membrane potential of approximately -70 mV.

The resting membrane potential is caused by the differences in ion concentrations across the cell membrane and the selective permeability created by ion channels.

Leakage channels allow Na+ to slowly move into the cell, while the Na+/K+ pump restores the concentrations. These processes play a role in maintaining the membrane potential.