Which hormone is primarily secreted by the thyroid gland?
Solution
Correct Answer: Option A
- The hormone primarily secreted by the thyroid gland is Thyroxine.
- This hormone plays a crucial role in regulating the body's metabolic rate, heart and digestive functions, muscle control, brain development, and maintenance of bones.
- The thyroid gland produces two major hormones: Thyroxine (T4) and Triiodothyronine (T3), with Thyroxine being the principal hormone secreted in larger amounts. These hormones contain iodine, which is essential for their synthesis.
- Other options mentioned like Parathormone are secreted by the parathyroid glands, Calcitonin gene-related peptide is a neuropeptide related to calcitonin but not the primary hormone of the thyroid, and Adrenocorticotropic hormone (ACTH) is secreted by the pituitary gland, not the thyroid.
Therefore, the correct answer is Thyroxine.
Reference: Ganong's Review of Medical Physiology, 26th Edition, Chapter 48: Thyroid gland - Page 699
- This hormone plays a crucial role in regulating the body's metabolic rate, heart and digestive functions, muscle control, brain development, and maintenance of bones.
- The thyroid gland produces two major hormones: Thyroxine (T4) and Triiodothyronine (T3), with Thyroxine being the principal hormone secreted in larger amounts. These hormones contain iodine, which is essential for their synthesis.
- Other options mentioned like Parathormone are secreted by the parathyroid glands, Calcitonin gene-related peptide is a neuropeptide related to calcitonin but not the primary hormone of the thyroid, and Adrenocorticotropic hormone (ACTH) is secreted by the pituitary gland, not the thyroid.
Therefore, the correct answer is Thyroxine.
Reference: Ganong's Review of Medical Physiology, 26th Edition, Chapter 48: Thyroid gland - Page 699
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