The sole purpose of the parathyroid glands is to regulate the calcium levels so the nervous and muscular systems can function properly. They are four pea sized glands located behind the thyroid.

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Parathyroid.com
Discusses diseases, symptoms, tests, and treatments, including mini-surgery.
BBC News Health - Human Gland evolved from Gills
The human parathyroid gland, which regulates calcium levels, probably evolved from fish gills, say researchers. (December 07, 2004)

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