Key players:
Receptors: Nicotinic (ganglia) & muscarinic (organs)
Neurotransmitter: Acetylcholine (ACh)
Enzyme: Ester (Acetylcholine esterase)

Processes:
Esterase process: ACh breaks down
                   AcetylCholine (ACh)===esterase===> Acetate + Choline ====neural uptake====> Acetylcholine
Parasympathomimetic: = mimics PNS agents = cholinergic effects = stimulates PNS
                  Binds to ACh receptors to induce an effect
                  Inhibits ACh esterase
Parasympatholytics: = inhibits PNS = anti-cholinergic effects
                  Binds to ACh receptors to block an effect preventing ACh from inducing an effect

Effects: rest & digest

Mnemonics:
Muscarinic: The 3 musketeers

3 Musketeers = Muscarinic receptors