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If the thyroid gland malfunctioned and failed to secrete sufficient thyroxine, you would expect to find

an abnormally
A. high rate of metabolism in the patient
B. small pituitary gland
C. low concentration of thyrotropic hormone (TSH) in the patient's bloodstream
D. high concentration of TSH in the bloodstream

1 answer

D. high concentration of TSH in the bloodstream

When the thyroid gland fails to secrete enough thyroxine, the pituitary gland releases more TSH in an attempt to stimulate the thyroid gland to produce more hormone. Therefore, a high concentration of TSH in the bloodstream would be expected.