While visiting the jungles of South America in the early part of the 20th century, Eugene was shot with a poison dart. He immediately became paralyzed. The toxin in the dart most likely blocked the action of

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Quizplus · Accepted Answer

Acetylcholine is a neurotransmitter that is involved in muscle contraction. Blocking its action can lead to paralysis, as seen in the case of Eugene being shot with a poison dart. Serotonin, dopamine, and noradrenaline are other neurotransmitters with different functions such as mood regulation and arousal, but they are not directly involved in muscle contraction.

While Visiting the Jungles of South America in the Early