TSH
A) is stimulated by thyrotropin-releasing hormone (TRH).
B) is inhibited by T3 and T4.
C) increases the rate of thyroid hormone secretion.
D) promotes hypertrophy and hyperplasia of thyroid cells.
E) all of these answers.

Question

Quizplus · Accepted Answer

TSH secretion is primarily regulated by the negative feedback loop involving T3 and T4 levels. TSH is stimulated by the hypothalamic hormone TRH, which triggers the release of TSH from the anterior pituitary gland. TSH, in turn, increases the production and secretion of T3 and T4 by the thyroid gland. Prolonged elevation of TSH promotes hypertrophy and hyperplasia of thyroid cells. Therefore, all of the given options are correct.