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Neurotransmitter

Definition

A neurotransmitter is a chemical substance that transmits signals between nerve cells in the brain and other parts of the body.

Analogy

Think of neurotransmitters as messengers delivering important information between different brain cells, just like how text messages deliver information between friends.

Related terms

Synapse: The small gap where neurotransmitters are released from one neuron and received by another.

Serotonin: Another neurotransmitter involved in regulating mood, appetite, and sleep.

Acetylcholine: A neurotransmitter responsible for muscle movement and memory.

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.