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- Serotonin
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A neurotransmitter involved in mood management and associated with happiness. Often called the “happiness hormone”, serotonin activates or inhibits brain activity depending on the receptor to which it binds. Serotonin is essential for neurons to communicate with each other.
- Glutamate (or glutamic acid) :
The most important excitatory neurotransmitter of the central nervous system.
- Grey matter :
Part of the tissues of the central nervous system consisting essentially of the cell bodies and dendrites of neurons.