[1] The M-channel is a voltage-gated K+ channel (Kv7/KCNQ family) that is named after the receptor it is influenced by.
The M-channel is important in raising the threshold for firing an action potential.
Furthermore, when the muscarinic acetylcholine receptor (MAChR) is activated, the channel closes.
[3] M-channels are the reason for slow depolarizations produced by ACh and LHRH in the autonomic ganglia and other specified areas.
Potassium efflux counteracts sodium influx in action potential (AP).