A client has been diagnosed with depression. He asks the nurse what imbalances influence depression. Which of the following best explains the neurochemical processes responsible for depression?

Choice A reason: Glucocorticoid activity is related to stress response and the hypothalamic-pituitary-adrenal axis. While abnormalities here can contribute to depression, decreased glucocorticoid activity is not the primary neurochemical imbalance associated with depression. Choice B reason: Increased dopamine activity is more commonly linked to conditions such as schizophrenia or mania. Depression is typically associated with reduced neurotransmitter activity, not increased dopamine. Choice C reason: The most widely accepted neurochemical explanation for depression is decreased activity of serotonin and norepinephrine. These neurotransmitters regulate mood, sleep, appetite, and energy. Deficits in their activity lead to the hallmark symptoms of depression, making this the correct answer. Choice D reason: The kindling process refers to repeated stimulation of neural pathways that can lower the threshold for mood episodes, particularly in bipolar disorder. While it may play a role in mood disorders, it is not the primary explanation for depression’s neurochemical imbalance.