A 23-year-old backpacker is brought to emergency due to sudden-onset vomiting, nausea, dizziness, and headache while picking nectarines. Her pulse is 50. Blood pressure is 90/60. She has generalized weakness, 1-mm pupils, and diaphoresis. Which of the following is the most likely explanation for these findings?
Decreased release of acetylcholine from pre-synaptic vesicles
Decreased stimulation of post-synaptic receptors by acetylcholine
Decreased synaptic activity of cholinesterase
Increased metabolic breakdown of acetylcholine in the synapse
Increased release of acetylcholine from pre-synaptic nerves
