The thyroid-stimulating hormone (TSH) increases secretion in response to which hormone?
a. Low levels of circulating thyroid hormone
b. High levels of circulating thyroid hormone
c. Low levels of circulating adrenocorticotropic hormone
d. High levels of circulating adrenocorticotropic hormone
ANS: A
As blood concentrations of the target hormones reach normal levels, a negative message is sent to the anterior pituitary to inhibit release of the tropic hormone. For example, TSH responds to low levels of circulating TH. As blood levels of TH reach normal concentrations, a negative feedback message is sent to the anterior pituitary, resulting in diminished release of TSH. Adrenocorticotropic stimulates the adrenals to secrete glucocorticoids.
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