Final answer:
Botox inhibits exocytosis by preventing acetylcholine release at the neuromuscular junction, which affects muscle contraction.
Step-by-step explanation:
Botox inhibits exocytosis at the neuromuscular junction. Specifically, botox blocks the release of the neurotransmitter acetylcholine by cleaving proteins necessary for the synaptic vesicles to bind and fuse with the membrane of the motor neuron's axon terminal. This inhibition prevents muscle contraction, resulting in muscle relaxation which is used both medically and cosmetically.