Once a Threshold Is Reached

question 81

Multiple Choice

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.

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