<human>:  I have a question about the neurotransmitter Acetylcholine. What is its role in the brain?
<bot>: Acetylcholine is a neurotransmitter that is involved in memory, learning, and attention. It is also involved in muscle movement. It is produced in the brain and is released into the synapse, where it binds to receptors on the postsynaptic membrane. This binding causes the release of other neurotransmitters, which then bind to receptors on the postsynaptic membrane.