Depolarization of an axon is a positive feedback mechanism because ________.
A. as more sodium channels open, the membrane potential decreases
B. as more sodium diffuses into the axon, the more voltage-gated sodium channels open
C. as more potassium channels open, the membrane potential decreases
D. as more sodium diffuses into the axon, the more voltage-gated potassium channels open
Answer: D
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