<prompt> Which of the following can act as both excitatory and inhibitory neurotransmitter?AcetylcholineGlutamateNorepinephrineDopamine  <response>: The dopamine is believed to act as an inhibitory transmitter in the basal ganglia, but in some other areas of the brain, it is possibly excitatory. It also functions as a stabilizer under some conditions.Ref: Guyton; 13th edition; Chapter 57 Contributions of the Cerebellum and Basal Ganglia to Overall Motor Control 