________ refers to the chemical messengers released by the neurons for communicating with other cells.

• A. Synapses
• B. Dopamine sensors
• C. Neurotransmitters
• D. Neuromessengers

Answer: (C)

Chemically mediated signaling in the nervous system relies on neurotransmitters, the chemical messengers released by neurons to talk to other cells. When a neuron fires, calcium-driven vesicle release dumps these messengers into the synaptic cleft at the presynaptic terminal. They then diffuse across the gap and bind to receptors on the postsynaptic cell, triggering changes that can either excite or inhibit the next cell. Afterward, the signal is turned off as neurotransmitters are reabsorbed, broken down by enzymes, or diffuse away, keeping communication precise and brief. The physical junction where this exchange occurs is a synapse, but the messengers themselves are the neurotransmitters. Terms like dopamine sensors aren’t standard for this concept, and neuromessengers isn’t the conventional term used in biology. Neurotransmitters is the precise word for these chemical messengers.