CHRM2 (Cholinergic Receptor Muscarinic 2): CHRM2 is part of the muscarinic cholinergic receptor family, playing a crucial role in mediating acetylcholine's effects in both the central and peripheral nervous systems. This G protein-coupled receptor participates in key physiological processes such as regulating heart rate, smooth muscle contraction, and cognitive functions. CHRM2 has a significant impact on cardiovascular regulation by helping to slow heart rate and reduce cardiac contractility. In the brain, it is linked to memory and learning and may play a role in certain neurological disorders.