When acetylcholine lands on a neuron's receptor, what mechanism is initiated? 2nd messenger?

[Gauss44]

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Title says it all.

(I don't really think it's second messenger, but I'm not sure what else it could be.)

 

[Czarcasm]

Depends on the effector organ. In skeletal muscle its ionotropic (causes depolarization). In visceral organs (autonomic - parasympathetic division) its metabotropic and acts via g linked protein receptor... Leading to the cascade ur referring to.