THYROID GLAND
THYROID GLAND o Thyroid Gland is located immediately below the larynx on its either side and anterior to trachea. o It weighs about 15-20gms o Thyroid gland has number of follicles filled with colloid and lined by Cuboid epithelial cells. o The major component of colloid is a large glycoprotein Thyroglobulin which contains the thyroid hormones within it. o Thyroid gland secretes 2 major hormones Ø Tetra-Iodo Thyronine(or) Thyroxine (or) T4 Ø Tri-Iodo Thyronine(or)T3 THYROID HORMONES o The principle hormones secreted by the follicular epithelial cells are T3 and T4 o About 93% of metabolically active hormones secreted by thyroid gland is T4 and 7% are T3. o T3 is more potent than T4 o T3 has short half-life than T4 Chemistry o Both Thyroxine and Tri Iodo thyronine are formed from Tyrosine of Thyroglobulin by Iodination. T3 (Tri Iodo thyronine) o Molecular weight -65...


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