Under normal circumstances, individuals do not produce too much thyroxine because
A)the amount of available iodine is limited.
B)negative feedback control of TRH and TSH release.
C)excess thyroxine is converted into inactive triiodothyronine.
D)the thyroid gland is incapable of producing too much.
E)all of the choices are correct.

Question

Quizplus · Accepted Answer

Negative feedback control of TRH and TSH release helps regulate thyroxine production. When thyroxine levels are high, it inhibits the release of TRH and TSH, which in turn reduces the production and release of thyroxine by the thyroid gland. This helps maintain normal levels of thyroxine in the body. The other choices are not entirely correct or complete explanations.

Under Normal Circumstances, Individuals Do Not Produce Too Much Thyroxine