Neurotransmitters, the Chemical Messages of the Brain, Rules and Mechanisms, A Review

Document Type : Review

Authors

1 university of Basrah

2 alkunooze university

3 university of basrah

Abstract
The human brain contains an estimated 86 billion neurons. Those billions of brain cell communicate by passing chemical messages at the synapse, the small gap between cells, in a process called neurotransmitters. Those chemical messages are unique molecules called neurotransmitters.
There are many types of neurotransmitters in the brain. But they do have a few things in common, the neurotransmitters are endogenous or produced inside the neuron itself. When cell is activated, these neuro chemicals are released into the synapse from specialized pouches clustered near the cell membrane called synapse vesicles. Specific receptors on neighboring cells can then take up the neurotransmitters, which can increase or decrease the signal being passed along a particular circuit. The human brain contains an estimated 86 billion neurons. Those billions of brain cell communicate by passing chemical messages at the synapse, the small gap between cells, in a process called neurotransmitters. Those chemical messages are unique molecules called neurotransmitters.
There are many types of neurotransmitters in the brain. But they do have a few things in common, the neurotransmitters are endogenous or produced inside the neuron itself. When cell is activated, these neuro chemicals are released into the synapse from specialized pouches clustered near the cell membrane called synapse vesicles. Specific receptors on neighboring cells can then take up the neurotransmitters, which can increase or decrease the signal being passed along a particular circuit.

Keywords

Crossmark

Volume 12, Issue 2
Spring 2026
Pages 157-167

  • Receive Date 02 January 2026
  • Revise Date 15 March 2026
  • Accept Date 19 March 2026
  • First Publish Date 19 March 2026
  • Publish Date 01 April 2026