CHRM3: ProductsMuscarinic cholinergic receptors, including CHRM3, belong to the family of G protein-coupled receptors. Muscarinic receptors influence many effects of acetylcholine in the central and peripheral nervous system. CHRM3 controls smooth muscle contraction. Its stimulation causes secretion of glandular tissue. CHRM3 may play an important role in the pathogenesis of myopia.