Over 99% of the circulating thyroid hormone is bound to plasma proteins.

Name: Over 99% of the circulating thyroid hormone is bound to plasma proteins.
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Question

Quizplus · Accepted Answer

This is true. Only a very small amount of thyroid hormone (less than 1%) is actually free and unbound in the bloodstream. The rest is bound to proteins such as thyroxine-binding globulin, transthyretin, and albumin. This bound hormone serves as a reservoir for the body, which can quickly release or sequester it as needed.

Over 99% of the Circulating Thyroid Hormone Is Bound to Plasma