CHRM2 (Cholinergic Receptor Muscarinic 2): CHRM2 is a member of the muscarinic cholinergic receptor family, which plays a vital role in mediating the effects of acetylcholine in both the central and peripheral nervous systems. This G protein-coupled receptor is involved in key physiological processes such as regulating heart rate, smooth muscle contraction, and cognitive functions. CHRM2 significantly impacts cardiovascular regulation by helping to slow the heart rate and reduce cardiac contractility. In the brain, it is linked to memory, learning, and may contribute to certain neurological disorders.