title: Dementia in the elderly: biochemical aspects.
mesh_terms: D000109:Acetylcholine / Q000096:biosynthesis*; D000368:Aged; D000544:Alzheimer Disease / Q000378:metabolism / Q000503:physiopathology*; D001921:Brain / Q000378:metabolism / Q000503:physiopathology; D002795:Choline O-Acetyltransferase / Q000378:metabolism; D002799:Cholinergic Fibers / Q000503:physiopathology*; D006801:Humans; D018377:Neurotransmitter Agents / Q000096:biosynthesis; D012701:Serotonin / Q000096:biosynthesis; D009435:Synaptic Transmission
chemical_list: D018377:Neurotransmitter Agents; D012701:Serotonin; D002795:Choline O-Acetyltransferase; D000109:Acetylcholine