6) Your Parathyroid Glands
Despite the similarity in their names, there is no great connection between your parathyroid and thyroid glands.
Four tiny parathyroid glands, about the size of a grain of rice, keep your nervous system and muscular system in good running condition.
They regulate calcium levels by secreting parathyroid hormone. Calcium makes muscles contract and maintain proper electrical current for your nerves.
Sources:
An Overview of the Parathyroid
http://www.endocrineweb.com/endocrinology/overview-parathyroid
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