CAMPBELL BIOLOGY,VOL.II >CUSTOM<
CAMPBELL BIOLOGY,VOL.II >CUSTOM<
17th Edition
ISBN: 9781323803677
Author: Urry
Publisher: PEARSON
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Chapter 45, Problem 6TYU

Which of the following is the most likely explanation for hypothyroidism in a patient whose iodine level is normal?

(A) greater production of T3 than of T4

(B) hyposecretion of TSH

(C) hypersecretion of MSH

(D) a decrease in the thyroid secretion of calcitonin

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Which of the following is the most likely explanation forhypothyroidism in a patient whose iodine level is normal?(A) greater production of T3 than of T4(B) hyposecretion of TSH(C) hypersecretion of MSH(D) a decrease in the thyroid secretion of calcitonin
1) Hormone pathologies often manifest with elevated or lower hormones. The underlying cause may differ. What symptoms would be associated with hyperthyroidism?  2) Autoimmune disease in which auto-antibodies stimulate the TSH receptor (TSHR) on the thyroid gland. How would this affect levels of TRH, TSH, and TH?  Draw out the H-P-T axis to illustrate changes in each hormone. 3) What symptoms would be associated with hypothyroidism? 4) How could this disease be treated? When the thyroid cells are destroyed, they cannot make hormones anymore and TH replacement needs to be given.
In Graves' disease, the body attacks the thyroid gland tissue and causes it to overproduce thyroid hormones, resulting in elevated blood levels of  T3 and T4.  Which of the following statements would be TRUE? Since blood levels of thyroid hormones are elevated, the hypothalamus would not release TRH and the Anterior Pituitary Gland would release more TSH. Since blood levels of thyroid hormones are elevated, the hypothalamus would release more TRH and the Anterior Pituitary Gland would then stop releasing TSH.  Since blood levels of thyroid hormones are elevated, the hypothalamus would not release TRH and the Anterior Pituitary Gland would not release TSH. Since blood levels of thyroid hormones are elevated, the hypothalamus would not release TSH and the Anterior Pituitary Gland would not release TRH.
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