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Question

In a normal thyroid gland of an adult, triiodothyronine is mostly derived from

A
Thyronine
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B
Thyromine
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C
Thyroxine
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D
All of the above
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Solution

The correct option is C Thyroxine
  • A normal adult thyroid gland weighs 10 to 20 g and receives blood from bilateral superior and inferior thyroid arteries and a small artery called the thyroid ima.
  • The thyroid secretes two hormones. Thyroxine (T4) makes about 90% of hormone production and triiodothyronine (T3) produces the other 10%. Peripheral tissues convert T4 to T3, and most of T3 is derived from T4.

Therefore, the correct answer is option C.

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