Which of the following best describes what is happening when an action potential is generated?
A. Depolarization reaches a threshold, and sodium rushes into the neuron.
B. Depolarization reaches a threshold, and sodium rushes out of the neuron.
C. Sodium flows out of the neuron, while potassium flows in.
D. Hyperpolarization occurs and neurotransmitters are released.
Answer: A
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