A 34-Year-Old Man Comes to the Emergency Department Complaining of Weakness

A 34-year-old man comes to the emergency department complaining of weakness, dizziness, and paresthesias involving his face and extremities.  He has never had symptoms like this before.  Two hours earlier, he ate fish at a new Japanese restaurant.  Neurological examination shows reduced muscle strength and decreased deep-tendon reflexes.  Which of the following parts of the action potential curve is most likely impaired in this patient?

A) A
B) B
C) C
D) D
E) E

Correct Answer:

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