One reason for the resting membrane potential (between -70mV and -90mV) is that
A) there are extra Na+ ions outside the plasma membrane, and extra Cl- ions inside the plasma membrane.
B) Na+ ions diffuse down their concentration gradient to the outside of the cell.
C) K+ ions diffuse down their concentration gradient to the outside the cell.
D) large protein ions diffuse to immediately outside the plasma membrane.
E) fewer Ca2+ ions inside the plasma membrane make the inside more negative.
Answer: C) K+ ions diffuse down their concentration gradient to the outside the cell.
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