Daily Rate of Secretion of Thyroxine and Triiodothyronine

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About 93 per cent of the thyroid hormone released from the thyroid gland is normally thyroxine and only 7 per cent is triiodothyronine. However, during the ensuing few days, about one half of the thyroxine is slowly deiodinated to form additional triiodothyro-nine. Therefore, the hormone finally delivered to and

Monoiodotyrosine + Diiodotyrosine HO

Diiodotyrosine + Diiodotyrosine

Diiodotyrosine + Diiodotyrosine

Figure 76-3

Figure 76-3

used by the tissues is mainly triiodothyronine, a total of about 35 micrograms of triiodothyronine per day.

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