The nurse explains that depression is thought to be the result of a deficit of:

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Serotonin is a neurotransmitter of the central nervous system.It is important in sleep,pain perception,and emotional states.Lack of serotonin can lead to depression.Norepinephrine and acetylcholine are neurotransmitters of the autonomic nervous system.Norepinephrine plays an important role in the fight-or-flight reaction (constriction of the blood vessels,dilation of the pupils,increased heart rate,increased awareness and vigilance).Acetylcholine causes decreased heart rate and force of contraction and plays a role in the sleep-wake cycle.Dopamine is located mostly in the brainstem.It is thought to play a role in controlling complex movements,motivation,and cognition.

The Nurse Explains That Depression Is Thought to Be the Result