Home › NEET UG › Biology › Chemical Coordination and Integration › Thyroid hormones T3 and T4 contain which element?
Thyroid hormones T3 and T4 contain which element?
AIron
BIodine (3 atoms in T3, 4 in T4)
CCalcium
DSulfur
Answer & Solution
Correct answer: B. Iodine (3 atoms in T3, 4 in T4)
T3 = triiodothyronine, T4 = thyroxine (tetraiodothyronine). Both contain iodine. Made from tyrosine + iodine in thyroid follicles. T3 more active. Iodine deficiency → goiter, hypothyroidism. Iodized salt prevents deficiency.
Related questions
Estrogen and progesterone, secreted mainly by ovaries during reproductive cycle, are:Cortisol secretion peaks in the:Growth Hormone (GH) excess in childhood causes:Refer to the figure of the human endocrine system:
![diagram](https://qallery.app/diagramHypothalamus secretes releasing and inhibiting hormones that act on:Insulin is secreted by:The endocrine system uses ___ to coordinate body functions.