Correct Answer: B
Explanation:
(b) The thyroid gland secretes three hormones :thyroxine or tetraiodothyronine (T4)’, triiodothyronine (T,)2 and calcitonin. Thyroxine and Triiodothyronine are iodinated forms of the amino acid tyrosine. They are stored in the colloid that fills the follicles, and are released to the blood when needed. The storage occurs in an unusual place, the extracellular colloid.