Thyroid Hormones: Mastering the Importance of the Thyroid.
Thyroid hormones are chemical substances, made in and secreted by the thyroid gland. They are essential for normal metabolism and development. There are three types of thyroid hormones—thyroxine (T4), triiodothyronine (T3), and calcitonin. What Is the Thyroid? The thyroid is a small, butterfly-shaped gland located at the front of your neck, just above your collarbone. It’s a crucial part of your
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