ENDOCRINE SYSTEM
THYROID FOLLICULAR CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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T4
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T3
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reverseT3
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None of the above
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Detailed explanation-1: -Triiodothyronine (T3), the active form of thyroid hormone is produced predominantly outside the thyroid parenchyma secondary to peripheral tissue deiodination of thyroxine (T4), with <20% being secreted directly from the thyroid.
Detailed explanation-2: -Therefore, T4 is generally considered to be the inactive form of thyroid hormone, and T3 is considered the active form of it. Cells in the following tissues, glands, organs and body systems can convert T4 to T3: Liver.
Detailed explanation-3: -Thyroxine, the most abundant thyroid hormone, contains four iodine atoms and is nicknamed T4, while triiodothyronine, the most active form, has three and is referred to as T3.
Detailed explanation-4: -The normal thyroid gland produces about 80% T4 and about 20% T3, however, T3 possesses about four times the hormone “strength” as T4.