Botox is a clinical preparation containing botulinum toxin. This toxin causes botulism by interfering with the exocytosis of acetylcholine at the neuromuscular junction. Often Botox is given to temporarily eliminate wrinkles in the forehead area. Based on your knowledge of events at the neuromuscular junction, explain what is happening to eliminate the wrinkles. What would happen if someone was exposed to a large amount of botulinum toxin?