<prompt> Which of the following neurotransmitters are decreased in alzheimers disease?AcetylcholineNorepinephrineCoicotropinAll the above  <response>: Ans. is d i.e., All the aboveRef - Niraj Ahuja e p. 25; Dementia by Brown and Hilhn like p. 60 Neurotransmitters in Alzheimers disease:Acetylcholine has a major role in memory functions and deficiency in cholinergic functioning is associated with memory disturbances paicularly sho term memory.In Alzheimers disease there loss of cells in the nucleus basalis of meyer net results in marked reduction in choline acetyltransferase CHAT, an enzyme involved in the synthesis of acetylcholine Decreased Acetylcholine. 