Which one of the following is a correct statement?

T_{4}

is more active than

T_{3}

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T_{3}

is more active than

T_{4}

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T_{3}

and

T_{4}

are the same.

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None of the above.

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Solution

The correct option is B $T_{3}$ is more active than $T_{4}$ .
The follicular cells of the thyroid gland synthesize two thyroid hormones; Tetraiodothyronine (T4-Thyroxine) and triiodothyronine (T3) and the C-cells of thyroid gland produces Thyrocalcitonin. The function of these hormones are as follows
Thyroxine is the main hormone (80% in thyroxine form) secreted into the bloodstream by the thyroid gland.
It is the inactive form and most of it is converted to an active form called as triiodothyronine (T3) by organs such as the liver and kidneys.
Both T4 and T3 are synthesized from tyrosine and iodine.
The thyroid hormones control the metabolism of carbohydrates, protein and fats. They play an important role in regulating the Basal Metabolic Rate (BMR)

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