New research indicates that the interaction between ________ and dopamine is critical in schizophrenia.

A) adrenal
B) cortisol
C) serotonin
D) norepinephrine

While all of the listed neurotransmitters and hormones play a role in the regulation of mood and behavior, research has specifically linked abnormalities in the functioning of serotonin and dopamine systems to the development of schizophrenia. In particular, studies suggest that serotonin binds to dopamine receptors in the brain and modulates dopamine signaling, and that imbalances in these systems may contribute to symptoms of the disorder.