The thyroid is one of the largest endocrine glands in the body. This gland is found in the neck inferior to (below) the thyroid cartilage (also known as the Adam's apple in men) and at approximately the same level as the cricoid cartilage. The thyroid controls how quickly the body burns energy, makes proteins, and how sensitive the body should be to other hormones.
http://en.wikipedia.org/wiki/Thyroid
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Quick question... Why is this in the geometry and math category? If you want medical advise, put it in that category please.
check out thr thiroid