Which of the following characteristics are true for an action potential?
I-A threshold potential must be exceeded for an action potential to occur.
II-A stimulus either produces a full action potential or none at all.
III-During the refractory period it is less likely that stimuli can produce another action potential.
A. I only
B. I and II
C. II and III
D. I and III
E. I, II, and III
E. I, II, and III
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