Everyone feels, react and act. So, what triggers this feelings and actions in human? Serotonin does. Serotonin is a chemical that acts in the brain and other parts of the body to influence many feelings, actions and processes.

Some of the important functions regulated by serotonin include appetite, sleep, aggression, and moods. In the brain and the rest of the nervous system, serotonin acts as a neurotransmitter, a chemical that carries signals from one nerve cell to another.

In many cases, serotonin acts by modifying the effects of other neurotransmitters. Serotonin also helps shape early brain development. Serotonin occurs widely in plants and in other animals as well as in human beings.

Does that mean plants also have feelings?

Where is serotonin produced?

A group of cells in the base of the brain produce serotonin from an amino acid called L-tryptophan. Serotonin is also made in the digestive system and by certain skin and blood cells. Scientists have identified more than a dozen kinds of serotonin receptors in different areas of the body.

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