What is the resting membrane potential of a typical mammalian neuron, and which ion is primarily responsible for setting it?
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A
-70 mV, primarily determined by K⁺ equilibrium and leak conductance
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B
+30 mV, primarily determined by Na⁺ influx
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C
-70 mV, primarily determined by Cl⁻ equilibrium
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D
-55 mV, primarily determined by Ca²⁺ gradient