Abnormal violent contractions of skeletal muscles, Biology

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Person Z swallowed a large amount of substance X and, as a result, has convulsions (abnormal violent contractions of skeletal muscles). Swallowing which of the following substances could lead to convulsions?

A. An agonist of the glycine receptor.

B. An antagonist of the nicotinic ACh receptor.

C. A blocker of the voltage-gated sodium channel.

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