Once a threshold is reached,
a. the number of sodium gates that open depends
upon the strength of a stimulus and its duration.
b. a graded local potential will be unable to spread
to a trigger zone of the nerve membrane.
c. the resting potential of a neuron is restored.
d. potassium channels in the input zone open.
e. progressive opening of more and more sodium
gates and the accompanying flow of sodium ions
is an example of positive feedback.
Answer: e
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