The anterior pituitary gland secretes thyroid-stimulating hormone (TSH) in response to the:
A. hypothalamus' secretion of thyrotropin-releasing hormone (TRH).
B. thyroid gland, which is constantly regulating the metabolic rate.
C. core body temperature, which is regulated by the hypothalamus.
D. secretion of growth hormone by somatotroph cells within the pituitary gland.
Answer: A. hypothalamus' secretion of thyrotropin-releasing hormone (TRH).
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