_____ was used to make poison arrowheads by South American natives.

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Curare is a well-known acetylcholine antagonist which causes paralysis of skeletal muscles by blocking the transmission of nerve impulses at the neuromuscular junction. Therefore, it is a potent muscle relaxant, but it can be deadly in high doses as it can also cause respiratory paralysis. South American natives would use it to make poison arrowheads, which could incapacitate or kill their prey or enemies.

_____ Was Used to Make Poison Arrowheads by South American