SSC CGL
MediumQ. No. which-organ-secretes-thyroxine-hormone
Which organ secretes thyroxine hormone?
Last Updated:
APituitary gland
BAdrenal gland
CThyroid gland
DParathyroid gland
Correct Answer: Thyroid glandYour Answer: C
Last Updated:
✅ Correct Answer: C — Thyroid gland
Thyroxine (T4) and Triiodothyronine (T3) are produced by the Thyroid Gland, a butterfly-shaped gland located at the front of the neck. These hormones regulate: Metabolic rate (BMR), Heart rate, Body temperature, Growth and development, and protein synthesis. They require Iodine for their production.
❌ Why other options are wrong:
• A. Pituitary gland — Pituitary releases TSH (Thyroid Stimulating Hormone) which stimulates the thyroid to produce thyroxine, but it doesn't produce thyroxine itself. Also produces GH, ACTH, FSH, LH.
• B. Adrenal gland — Adrenal gland produces Adrenaline (epinephrine), Cortisol, Aldosterone; not thyroxine.
• D. Parathyroid gland — Parathyroid glands (4 small glands behind thyroid) produce PTH (Parathyroid Hormone) which regulates calcium levels; not thyroxine.
📝 Important Note: Thyroid gland = Thyroxine (T3, T4). Hyperthyroidism = excess thyroxine (fast metabolism, weight loss). Hypothyroidism = low thyroxine (slow metabolism, weight gain). Goitre = enlarged thyroid from iodine deficiency. TSH from pituitary controls thyroid. Critical SSC CGL endocrine system topic.
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