Monoamine oxidase acts upon the nervous system by neurotransmission.

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Monoamine oxidase (MAO) is an enzyme that breaks down various neurotransmitters, including dopamine, norepinephrine, and serotonin, in the synapses of the nervous system. MAO inhibitors are used as antidepressants, and they increase the levels of these neurotransmitters by inhibiting the activity of MAO. Therefore, MAO acts by inhibiting the breakdown of neurotransmitters, thus increasing their activity in the nervous system.

Monoamine Oxidase Acts Upon the Nervous System by Neurotransmission