Final answer:
Depression involves an imbalance of neurotransmitters, specifically serotonin, in the brain. Medications called antidepressants help restore normal serotonin levels. Chronic stress and dysregulation of the stress system can also contribute to the development of depression.
Step-by-step explanation:
Depression is a complex condition that involves both neurobiological and environmental factors. One neurobiological mechanism of depression is the imbalance of neurotransmitters, such as serotonin, in the brain. Low levels of serotonin can contribute to the development of depression, and medications called antidepressants help restore normal serotonin levels.
Additionally, chronic stress and dysregulation of the stress system can also play a role in the development of depression. Research suggests that chronic uncontrollable stress may promote the onset of depression and a shift towards environment withdrawal.