Thyroid gland

The thyroid is an endocrine gland in the neck. It secretes thyroid hormones, which regulate the body's rate of metabolism, and calcitonin, a protein that assists in calcium balance. The production of thyroid hormones is stimulated by thyrotropin or Thyroid Stimulating Hormone (TSH), which is produced by the pituitary.

Types of thyroid hormones
Triiodothyronine and thyroxine are the two main forms of thyroid hormones. Thyroid hormones are partially comprised of iodine and a deficiency of iodine in the diet can lead to decreased production of these hormones. If left uncorrected the thyroid tissue can enlarge, resulting in a pronounced swelling in the neck, called a 'simple goitre.'

Learn more

 * American Thyroid Association webpage