Martin's father is experiencing memory loss related to alzheimer disease. in the context of neurotransmitters, this is most likely due to the insufficient production of in his brain.

Acetylcholine

Explanation:

Brain nerve cells communicate with each other through the release of chemicals; These chemicals are called neurotransmitters. Acetylcholine is an important neurotransmitter for memory. People with Alzheimer's disease have low levels of acetylcholine in the brain. For this reason, we can conclude that acetylcholine levels in Martin's father are below normal.

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