Mechanism of action of tetanospasmin
Ans. is 'a' i.e., Inhibition of GABA release . Tetanospasmin blocks the release of inhibitory neurotransmitters (GABA and glycine) in brain-stem and spinal cord.
Inhibition of GABA release
Inhibition cAMP
Inactivation of Ach receptors
Inhibition of cGMP