Author Question: The difference between the intracellular and extracellular environments at the peak of the action ... (Read 126 times)

2125004343 · **on:** Jun 21, 2018

The difference between the intracellular and extracellular environments at the peak of the action potential is approximately _________mV.

a. 70
b. 65
c. +40
d. +65

Question 2

At the beginning of an action potential, sodium moves

a. slowly into the cell, because electrical force is offset by diffusion.
b. rapidly into the cell, because both electrical force and diffusion operate at the same time.
c. slowly out of the cell, because as a positive ion, sodium remains attracted to the relatively negative intracellular environment.
d. rapidly out of the cell, because the sodium-potassium pumps are very active.