Muscarinic acetylcholine receptors (mAChRs) is a type of receptor of acetylcholine (that is, acetylcholine is what the body produces to activate it under usual physiologic situations) that responds to the constituent of certain mushrooms (namely Amanita muscaria) called muscarine. mAChRs are metabotropic and are found primarily in the autonomic nervous system (especially in the parasympathetic branch), and the cerebral cortex of the brain, hence playing a role in cognitive functions, especially memory and learning. Anticholinergic, that is, antagonists of the mAChRs produce constipation, dry mouth, blurred vision, dizziness, memory problems, changes in heart rate, reduced urine secretion and at higher doses psychosis. 

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