Question

During an action potential, which of the following changes significantly? Group of answer choices
a) The concentration gradients for Na+ and K+.
b) The number of Na+ and K+ ions crossing the cell membrane.
c) The membrane potential. The activity of the Na+/K+ ATPase.

Answer 1

The process is ocurring by steps, starting with depolarization.

1- Na+ permeability > K+ permeability

2- Vm (membrane potential) approaches ENa+ (quilibrium potential for potassium)

3- K+ permeability > Na+ permeability

4- Vm (membrane potential) approaches EK+ (quilibrium potential for potassium)