Plasma levels of protein-bound thyroxine fluctuate greatly in response to the body's use of thyroxine.

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Plasma levels of protein-bound thyroxine are relatively stable because the majority of thyroxine (T4) in the bloodstream is bound to proteins, which buffers against rapid changes in hormone levels. The body maintains these levels within a narrow range, adjusting the release of thyroxine from the thyroid gland as needed.

Plasma Levels of Protein-Bound Thyroxine Fluctuate Greatly in Response to the Body's