Surgery The mechanism of action of botulinum toxin A is best described by: A Postsynaptic receptor blockade B Acetylcholinesterase inhibition C Presynaptic blockade of acetylcholine release D Slowing of myelinated nerve fiber transmission 💡 Explanation The mechanism of action of botulinum toxin A is best described by: ✓ Correct Answer: C. Presynaptic blockade of acetylcholine release