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Explain the structure of the circular flow model.
Melatonin
A hormone that regulates sleep-wake cycles.
Biological Rhythms
Natural cycles of activity that the body goes through, such as sleep-wake cycles and hormonal fluctuations.
Acetylcholine
A neurotransmitter in both the central and peripheral nervous systems that plays a role in muscle activation and memory.
Alzheimer's Disease
A progressive neurodegenerative disorder characterized by memory loss, cognitive decline, and personality changes.
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