Clostridium botulinum toxin mode of action is by: March 2012: (A) Presynaptic block, (B) Postsvnaptic block, (C) Competitive inhibition of acetylcholine, (D) Destruction of acetylcholine
Answer is A. Ans: A i.e. Presynaptic block Cl. Botulinum toxin acts by blocking the production/ release of acetylcholine at the synapses & neuromuscular junctions