Monoamine oxidase is an enzyme that breaks down neurochemicals such as serotonin, dopamine, and norepinephrine.

The statement is correct because monoamine oxidase (MAO) is indeed an enzyme responsible for the breakdown of monoamines, which include important neurochemicals such as serotonin, dopamine, and norepinephrine. These neurotransmitters play critical roles in regulating mood, anxiety, and overall emotional state.

The action of MAO is vital for maintaining the balance of these neurotransmitters in the brain; when their levels are appropriately regulated, normal mood and behavior can be supported. An overactive form of MAO can lead to decreased levels of these neurotransmitters, which can contribute to mood disorders and anxiety. Thus, understanding the role of monoamine oxidase is essential in the context of mental health and suicide prevention, as alterations in these neurochemical pathways may indicate a higher risk for mood disorders, which can be associated with suicidal ideation and behavior.