When a neuron is activated by a threshold stimulation, ________ channels open, which allows these ions to quickly ________.
A. potassium ion; diffuse into the neuron
B. potassium ion; diffuse out of the neuron
C. sodium ion; diffuse into the neuron
D. sodium ion; diffuse out of the neuron
Answer: C
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A) chemical. B) organ. C) tissue. D) organ system. E) molecule.
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