T₃ (triiododthyronine) A) synthesis requires calcium. B) binding to target tissues causes increases in metabolism, body temperature, and normal growth. C) contains four iodine molecules. D) is released from the thymus gland. E) is released in response to T₄ secretion.

Question

Quizplus · Accepted Answer

Triiodothyronine, also known as T3, binding to target tissues causes increases in metabolism, body temperature, and normal growth. However, its synthesis does not require calcium (choice A is incorrect) and it contains three, not four, iodine molecules (choice C is incorrect). It is not released from the thymus gland (choice D is incorrect) and its secretion is not in response to the hormone T₄ (choice E is incorrect).

T3 (Triiododthyronine)

T₃ (Triiododthyronine)