Paul is a 55-year-old man who has been having some difficulty recalling important details. On visiting a doctor, he was told that he was in the early stages of Alzheimer's disease. The deficiency of __________ is most likely to be linked to Paul's condition.

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Acetylcholine is a neurotransmitter that is involved in memory and learning. In Alzheimer's disease, there is a degeneration of neurons that produce acetylcholine, leading to a deficiency of this important neurotransmitter. This deficiency is associated with the memory loss and cognitive decline that are hallmark features of the disease.

Paul Is a 55-Year-Old Man Who Has Been Having Some