Question 1 What neurotransmitter in excess can cause positive and negative symptoms in patients with schizophrenia? Norepineprhine Glutamate Serotonin GABA 2 pts 2 pts

## Step 1<br />The question asks us to identify the neurotransmitter that, when in excess, can cause both positive and negative symptoms in patients with schizophrenia. The options provided are Norepinephrine, Glutamate, Serotonin, and GABA.<br /><br />## Step 2<br />Schizophrenia is a complex mental disorder that is believed to be caused by a combination of genetic and environmental factors. The symptoms of schizophrenia are thought to be related to the balance of neurotransmitters in the brain.<br /><br />## Step 3<br />Among the options provided, Serotonin is the neurotransmitter that is most commonly associated with the symptoms of schizophrenia. Both positive symptoms (such as hallucinations and delusions) and negative symptoms (such as social withdrawal and lack of motivation) of schizophrenia have been linked to imbalances in serotonin 4<br />While other neurotransmitters like dopamine, glutamate, and GABA also play roles in the pathophysiology of schizophrenia, the question specifically asks for the neurotransmitter in excess that can cause both positive and negative symptoms. Serotonin fits this description best among the given options.