Biology question, help....?

Question

In what way does the interior surface of a cell membrane of a resting (nonconducting) neuron differ from the external environment? The interior is:

a. Negatively charged and contains more sodium
b. positively charged and contain less sodium
c. positively charged and contains more sodium
d. negatively charged and contains less sodium

Please explain why, thanks....

Answer 1

Neurons have a resting cell membrane potential of about -70 mV. This does not tell you the actual charge either inside or outside the cell, it just tells you the difference in charge between them. To keep things simple, scientists generally consider the interior of the cell to be the difference (in this case, -70 mV) and the outside 0 mV. In almost all cells, there is more sodium and chlorine outside the cell than inside, and more potassium inside the cell than outside.

Answer 2

d., i think.
i know that the interior is negatively charged at resting potential becauseit is more concentrated with potassium.
so, i would say d., but wait to see what some other people say.
I might have it backwards...
its either a. or d.

Answer 3

d