Which of the following provides the most accurate description of the formation of the thyroid hormones triiodothyronine (T3) and thyroxine (T4)?
A. The hypothalamus secretes TRH (thyrotropin-releasing hormone), which travels in the portal vein to the anterior pituitary to stimulate the secretion of TSH (thyroid-stimulating hormone) into the bloodstream, which, in turn, stimulates the production of T3 and T4 by the thyroid gland.
B. The hypothalamus secretes TRH (thyrotropin-releasing hormone), which travels in the portal vein to the posterior pituitary to stimulate the secretion of TSH (thyroid-stimulating hormone) into the bloodstream, which, in turn, stimulates the production of T3 and T4 by the thyroid gland.
C. The hypothalamus secretes TSH (thyroid-stimulating hormone), which travels in the portal vein to the anterior pituitary to stimulate the secretion of TRH (thyrotropin-releasing hormone) into the bloodstream, which, in turn, stimulates the production of T3 and T4 by the thyroid gland.
D. None of these are correct.
Answer: A
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