Question

Which hormone secreted by thyroid gland ?

• A. Thyroxine
• B. Adrenalin
• C. Testosterone
• D. Phyrotrophic

Answer 1

Answer: (A)

• The thyroid gland is composed of two lobes that are located on either side of the trachea.
• Follicular cells of the thyroid gland synthesize two hormones, tetraiodothyronine or thyroxine ($T_4$) and triiodothyronine ($T_3$).
• Thyroid hormones play an important role in the regulation of the basal metabolic rate.
• Hence the hormone secreted by the thyroid gland is thyroxine.
• So, the correct answer is 'Thyroxine'.