Ion concentration differences produce an action potential creating a signal. The difference between a weak signal and an intense signal is
A. weak stimuli only open sodium gates, strong signal also open potassium gates.
B. the frequency at which an axon fires.
C. the action potential is graduated and a weak signal causes a small change in polarity.
D. a strong signal does not allow repolarization but sends a constant flow of ions.
E. All of the choices are correct.
Answer: B
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