An individual suffering from Alzheimer’s disease does not have an appropriate amount of __________ to allow the brain to send and receive signals necessary for communication.

Neurotransmitters are chemical messengers that help brain cells send and receive signals. Alzheimer’s disease is associated with reduced levels of certain neurotransmitters, including acetylcholine, which can interfere with communication between brain cells. Therefore, the correct choice is neurotransmitters.

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