Effects of pharmacological blockers on action

1. What effect would treating an axon with TTX have on an action potential?
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2. How would TEA affect the action potential?
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3. Why does TTX does not have effect on puffer fish?
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4. Drug X, when applied to a nerve axon, results in both a gradual decrease in the amplitude of individual action potentials and a depolarization of the resting potential, both of which develop over a period of several hours. The drug is most likely:
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5. Tetraethylammonium structure is:
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