Although nicotine is probably the well-known chemical in cigarettes, it is not necessarily the one that changes the psyche of th

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问题 Although nicotine is probably the well-known chemical in cigarettes, it is not necessarily the one that changes the psyche of the smoker when cigarettes are smoked.
In order to transmit nerve impulses to its neighbor, a neurone sends ______ known as neuron-transmitters.

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答案chemical messengers

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