Hormone of thyroid gland
Thyroid hormone
Follicular cells of thyroid gland secretes two iodine containing hormone.
Iodine is essential for formation of thyroid hormone.
1. T3 Tri-iodothyronine (containing three iodine atoms)
2. T4 Thyroxine or Tetraiodothyronine ( containing of four iodine atoms)
3. Calcitonin
The release of T3 and T4 into blood is stimulated by thyroid stimulating hormone (TSH) from anterior pituitary.
Thyroid gland also produces and releases hormone calcitonin, which contribute regulation of blood calcium levels.
Calcitonin decreases concentration of calcium in blood.
Most calcium removed from blood is stored in bones.
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