CONNECTIVE TISSUE GLAND
ENDOCRINE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What percentage of circulating T3 and T4 are bound to albumin and plasma proteins
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1%
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99%
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75%
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25%
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Explanation:
Detailed explanation-1: -Approximately 99.97% of circulating T4 and 99.7% of circulating T3 are bound to these proteins.
Detailed explanation-2: -Thyroxine-binding globulin (TBG) binds most T3/T4 in the blood. A small portion of thyroid hormones circulate freely in the blood and constitute the physiologically active form.
Detailed explanation-3: -Well over 99% of circulating thyroxine (T4) and triiodothyronine (T3) is protein bound in the circulation, with bound and free moieties in constant rapid equilibrium.
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