Problem: A nursing student is learning about the neurotransmitter, dopamine, that is involved with psychiatric conditions. Which statement(s) does the student identify as correct regarding dopamine? Need Assignment Help? Select all that apply. It is an excitatory neurotransmitter. It is decreased in Parkinson disease. It is decreased in schizophrenia. It produces a calming effect. It may explain addictive behaviors. It produces physical symptoms of anxiety.