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The Pituitary Gland

In a normal t...

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 ( $T_{4}$ ) makes about 90% of hormone production and triiodothyronine ( $T_{3}$ ) produces the other 10%. Peripheral tissues convert $T_{4}$ to $T_{3}$ , and most of $T_{3}$ is derived from $T_{4}$ .

Therefore, the correct answer is option C.

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