CHRM2 (Cholinergic Receptor Muscarinic 2): CHRM2 is a member of the muscarinic cholinergic receptor family, which plays a key role in mediating the effects of acetylcholine in both the central and peripheral nervous systems. This G protein-coupled receptor is involved in important physiological processes such as heart rate modulation, smooth muscle contraction, and cognitive functions. CHRM2 significantly influences cardiovascular regulation by contributing to the slowing of heart rate and decreasing cardiac contractility. In the brain, it is associated with memory, learning, and may be involved in certain neurological conditions.