- A +70 mV
- B -70 mV
- C 0 mV
- D 120 mV
Correct answer: B. -70 mV
Explanation: The resting membrane potential is about -70 mV (inside negative relative to outside) due to K+ leakage and Na+/K+ pump.
Concept context
Brain, spinal cord, neurons, reflex arcs, and sense organs.