
A muscarinic receptor agonist is an agent that activates the activity of the muscarinic acetylcholine receptor. The muscarinic receptor has different subtypes, labelled M1-M5, allowing for further differentiation. ==Clinical significance== === M1 === M1-type muscarinic acetylcholine receptors play a role in cognitive processing. In Alzheimer disea...
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http://en.wikipedia.org/wiki/Muscarinic_agonist

Drugs that bind to and activate muscarinic cholinergic receptors (receptors, muscarinic). Muscarinic agonists are most commonly used when it is desirable to increase smooth muscle tone, especially in the GI tract, urinary bladder and the eye. They may also be used to reduce heart rate. ... (12 Dec 1998) ...
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http://www.encyclo.co.uk/local/20973
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