alleryStart learning →Rising thyroid hormone levels in the blood trigger a drop in the production of:
AATP and then ADP
BRNA and then DNA
CLDL and then HDL
DTRH and then TSH
Answer & Solution
Correct answer: D. TRH and then TSH
1. The thyroid is controlled from above by the hypothalamus and pituitary.
2. When enough thyroid hormone is circulating, that control chain eases off.
3. Elevated thyroid hormones trigger a drop in production of TRH and then TSH.
4. That is a classic negative feedback loop.
_Source: OpenStax Anatomy and Physiology 2e (CC BY 4.0), Ch 17 'The Endocrine System', sections 17.1-17.9_
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