<prompt> What is true statement of the following?Synaptic transmission is unidirectionalGlutamate is the major excitatory neurotransmitter in the nervous systemGABA and glycine are the major inhibitory neurotransmittersAll of above  <response>: synaptic transmission is always a unidirectional flow.Glutamate is considered as an excitaroty neurotrasmitter and GABA and glycine inhibitory. Ref: KD Tripathi 8th ed, central nervous system. 