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Hyperthyroidism. A. Primary hyperthyroidism results from the uncontrolled secretion of thyroid hormones by the thyroid gland, which exerts strong negative
feedback on thyrotropin-releasing hormone (TRH) and thyroid-stimulating hormone (TSH) secretion. B. Secondary hyperthyroidism results from the
uncontrolled secretion of TSH from the anterior pituitary, which drives thyroid hormone secretion. TRH levels are strongly suppressed. T3, triiodothyronine;
T4, thyroxine.
Source: Endocrine Physiology, Medical Physiology: The Big Picture
Citation: Kibble JD, Halsey CR. Medical Physiology: The Big Picture; 2015 Available at: http://mhmedical.com/ Accessed: May 09, 2017
Copyright © 2017 McGraw-Hill Education. All rights reserved
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