Thyrotropin-releasing hormone is secreted by the
A. hypothalamus and it increases release of thyroid-stimulating hormone from the anterior pituitary.
B. hypothalamus and it increases release of thyroid-stimulating hormone from the posterior pituitary.
C. thymus and it increases release of thyroid hormone from the thyroid gland.
D. anterior pituitary and it increases release of thyroid hormone from the thyroid gland.
E. parathyroid hormone and it increases release of thyroid hormone from the thyroid gland.
Answer: A
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