<prompt> Major inhibitory neurotransmitter in nervous system-GlutamateAspartateGamma-amino butyric acidTaurine  <response>: Ans. is c i.e., Gamma-amino butyric acid Gamma-aminobutyric acid GABA is the major inhibitory transmitter of CNS. It produces presynaptic indirect inhibition. Glycine is also an inhibitory transmitter and is mainly present in spinal cord. It produces direct inhibition. 