and animals as well as humans. In humans, it is synthesized
in the pineal gland and acts as a neurotransmitter. The bulk
of it is in the mucous membrane of the gastro-intestinal track,
where it triggers motility. It is also stored in the raph cells of the
central nervous system and, upon release in the brain regulates
numerous systems: appetite, thermogenesis, wake-sleep, sexual
attraction.
Because it is antagonistic to dopamine, anti-depressant
drugs often seek to up serotonin levels.
Eating serotonin has no effect while it is produced in the body from
amino acids. As a neurotransmitter, it will facilitate or hinder depending
on the receptors present. Let us note as well that receptor proportions
will be different for example in socially dominant or socially submissive
individuals, overweight or normal weight individuals. Serotonin will
suppress appetite in someone of normal weight but less so in someone
who is overweight…
Serotonin is present in the urticating hairs of some plants and animals,
acting as defense mechanisms or even projectiles.
It's name comes from serum and tonus as it contributes - in a mechanical
way - to the rigour of blood vessels.
Serotonin travels from the Raph nuclei throughout the brain.
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