When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway?

When a neuron responds to a particular neurotransmitter by opening gated ion channels, the neurotransmitter is serving as which part of the signal pathway? 



A) receptor
B) relay molecule
C) transducer
D) signal molecule
E) endocrine molecule



Answer: D


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