Which hypothesis was developed after it was shown that the effects of high doses of ketamine are similar to symptoms of schizophrenia? Group of answer choicesA major factor in schizophrenia is hypoactivity of the glutamatergic system, particularly NMDA receptor signaling.A major factor in schizophrenia is 5-HT2A receptor down-regulation.A major factor in schizophrenia is hypoactivity of the serotonergic system due to 5-HT inhibition.A major factor in schizophrenia is decreased dopaminergic transmission in the prefrontal cortex.

Which model of schizophrenia integrates the neurochemical data with the neuroanatomical findings concerning the disorder? Group of answer choicesThe dopamine hypothesisThe glutamate-dopamine modelThe DA imbalance hypothesisThe neurodevelopmental model

Which statement about glutamate and DA in regard to symptoms associated with schizophrenia is true? Group of answer choicesOverabundance of glutamate at the NMDA receptor may be a precursor to DA dysfunction and may explain increases in mesolimbic DA and decreases in PFC function.Insufficient glutamate at the NMDA receptor may be a precursor to DA dysfunction and may explain increases in mesolimbic DA and decreases in PFC function.NMDA receptors have indirect excitatory effects on of midbrain mesolimbic DA neurons that project to limbic regions.Schizophrenic symptoms are due to increased DA function in mesocortical neurons along with reduced DA function in mesolimbic dopaminergic neurons.

The positive symptoms of schizophrenia are believed to be associated with: Question 5 options: Increased activity of the mesocortical dopamine pathway Decreased activity of the mesolimbic dopamine pathway Decreased activity of the mesocortical dopamine pathway Increased activity of the mesolimbic dopamine pathway

I was prescribed a high dose of Haloperidol to alleviate my psychosis. After some time I developed symptoms for which one of the following and why?Group of answer choicesObsessive-Compulsive Disorder (OCD) due to decreased acetylcholine release by the presynaptic neuronParkinson's due to reduced postsynaptic dopamine receptor activation Delusional Schizophrenia due to reduced postsynaptic dopamine activationAlcoholism due to increased postsynaptic dopamine activation

Select the correct statement(s).Group of answer choicesDopamine is involved in the pathogenesis of addiction and dependence.Apart from its enzymatic degradation, acetylcholine may also be taken up by the presynaptic terminal and get recycled.The effect of acetylcholine is terminated by the activity of the enzyme called acetylcholinesterase.Decreased functional availability of acetylcholine, serotonin, and glutamate has all been implicated in the pathogenesis of depression.