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Aging and the Endocrine System
![Normal brain vs. brain affected by Alzheimer's disease](../../../../../../../../../figures.boundless-cdn.com/16231/full/s-disease-brain-comparison.jpeg)
Normal brain vs. brain affected by Alzheimer's disease
Combination of two brain diagrams in one for comparison. In the left normal brain, in the right brain of a person with Alzheimer's disease. Estrogen and testosterone demonstrate neuroprotective effects and have been theorized to play a role in reducing the effects of Alzheimer's disease.
Source
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"Alzheimer's disease brain comparison."
http://commons.wikimedia.org/wiki/File:Alzheimer's_disease_brain_comparison.jpg
Wikimedia
Public domain.