muscarinic acetylcholine receptor

Muscarinic receptors are those membrane-bound acetylcholine receptors that are more sensitive to muscarine than to nicotine. Those for which the contrary is true are known as nicotinic acetylcholine receptors. Muscarine and nicotine are both alkaloids. Many drugs and other substances (for example pilocarpine and scopolamine) act as agonists or antagonists of only muscarinic or only nicotinic receptors, making this distinction useful.
See more at Wikipedia.org...

Muscarinic /mus·ca·rin·ic/ denoting the cholinergic effects of muscarine on postganglionic parasympathetic neural impulses. [more]Muscarinic acetylcholine receptor - Community and Resources