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. Hyperparathyroidism (4) Hypocalcemia@ (4) Hypoparathyroidism (3) 1. BBC News Health - Human Gland evolved from Gills - The human parathyroid gland, which regulates calcium levels, probably evolved from fish gills, say researchers. 2. Endocrine Surgeon: Parathyroid - Includes a history, symptoms, diagnosis, and related topics done in a easy to read format. 3. Parathyroid.com - Discusses diseases, symptoms, tests, and treatments, including mini-surgery.

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