Botulinum Toxin (Botox) Injections Are a Popular Cosmetic Treatment Because

question 60

Multiple Choice

Botulinum toxin (Botox) injections are a popular cosmetic treatment because they allow an individual to temporarily reduce visible wrinkles in the skin (usually around the face) . What is a probable mechanism of Botox at the neuromuscular junction?

• A) Inhibition of muscarinic receptors that cannot then bind to ACh and cause an end-plate potential, causing muscle relaxation.
• B) Excitation of ACh vesicles in the pre-synaptic neuron allow for end-plate potentials to be fired and cause muscle tightness due to excess contraction.
• C) Inhibition of ACh vesicles in the pre-synaptic neuron prevent an end-plate potential and cause complete muscle relaxation.
• D) Excitation of the nicotinic receptors making them extra sensitive to ACh and causing more contractions with less ACh present in the NMJ.

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