Final answer:
Neurotransmitters are chemical messengers that transmit signals between neurons in the nervous system.
Step-by-step explanation:
The chemical messengers that cross the synaptic gaps between neurons are called neurotransmitters. These are substances that are released by a neuron and transmit signals to another neuron or target cell. They play a crucial role in communication within the nervous system. Examples of neurotransmitters include serotonin, dopamine, and acetylcholine.
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