The nurse is caring for a client diagnosed with bipolar disorder who is exhibiting the following symptoms: insomnia, exaggerated confidence, attention seeking, and easily agitated. Based on these symptoms, what does the nurse believe these symptoms are caused by?

A. Total cholesterol levels alone do not provide sufficient information about the lipid profile; it is important to assess individual components such as LDL, HDL, and triglycerides.

B. Very low-density lipoprotein (VLDL) is associated with increased risk of cardiovascular disease when elevated, so it should not be high.

C. Low-density lipoprotein (LDL) cholesterol is often referred to as "bad" cholesterol, and lower levels are associated with reduced risk of cardiovascular disease.

D. High-density lipoprotein (HDL) cholesterol is often referred to as "good" cholesterol, and higher levels are associated with reduced risk of cardiovascular disease.

A. GABA (gamma-aminobutyric acid) is not typically targeted by antidepressants.

B. While some antidepressants may indirectly affect epinephrine and norepinephrine levels, the primary mechanism of action for most antidepressants is through increasing levels of serotonin and/or norepinephrine.

C. Antidepressants commonly work by increasing the levels of neurotransmitters such as norepinephrine and serotonin in the brain.

D. The reticular formation is not directly involved in the mechanism of action of antidepressants.