What maintains the resting membrane potential of a neuron at about -70 millivolts?
Answer and explanation
Correct answer: A. The sodium-potassium pump and leak channels for potassium
- Step 1: The pump moves 3 sodium ions out and 2 potassium ions in. Step 2. Potassium leak channels let potassium out, which makes the inside negative. Answer: the pump and potassium leak channels. Why not the others: Neurotransmitter exocytosis occurs at the presynaptic terminal, while voltage-gated sodium channel activation and subsequent potassium repolarization mediate electrical action potential propagation along the axon.
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