The resting membrane potential is:
A. The same as the membrane equilibrium potential.
B. The voltage difference across a neuron's cell membrane, maintained by an unequal distribution of one specific ion.
C. Maintained by active transport of sodium ions (Na+) and potassium ions (K+) and passive diffusion of Na+, K+, and chloride ions (Cl–) through the cell membrane.
D. Typically measured at +70 millivolts (mV) because the intracellular environment is more positively charged than the extracellular environment.
E. Created by a more negative charge inside the membrane than outside because Na+ is continuously moved inside the cell membrane by an active transport pump.
ANS: C
Rationale: The resting membrane potential is maintained via passive diffusion of ions across the cell membrane and via active transport of Na+ and K+ by Na+/K+ pumps.
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