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The resting membrane potential of a typical neuron is approximately:
A$+70$ mV (positive inside)
B$0$ mV (no charge difference)
C$-30$ mV (slightly negative)
D$-70$ mV (negative inside)
Answer & Solution
Correct answer: D. $-70$ mV (negative inside)
Resting potential ≈ -70 mV (inside negative relative to outside). Maintained by Na+/K+ ATPase pumping 3 Na+ out + 2 K+ in. Threshold for AP firing: ~-55 mV.
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