What happens to a neuron when a stimulus reaches the threshold level?A. Channels in the plasma membranes open, allowing potassium to move into the cytoplasm to cause a temporary reversal in electrical charges.B. Channels in the plasma membranes open, allowing sodium to move into the cytoplasm to cause a temporary reversal in electrical charges.C. The sodium-potassium pump is activated, transporting sodium into the cytoplasm and potassium out of the cytoplasm.D. Channels in the plasma membranes open, allowing negatively charged proteins to move out of the cytoplasm temporarily.

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