Acetylcholine is a neurotransmitter, that is, this substance transmits information from one neuron to another. It is stored in vesicles in the presynaptic neuron, and is secreted during an electrical impulse in the synapse (space between two neurons). Then, it will bind to the receptors of the end of the second neuron to propagate this influx before being recaptured by its original end.
The effects are:
Flaccid paralysis,
Respiratory failure,
Activation of the parasympathetic nervous system with: salivation, bronchorrhea, miosis, sweat,