MCAT Question A Day - 6/27/14 - Answer!
Which of the following side-effects might be experienced by a patient who is administered a dose of thyroxine?
A. An increase in endogenous TSH production
B. A decrease in endogenous TSH production
C. An increase in endogenous thyroxine production
D. A decrease in endogenous parathyroid hormone production
B is correct. You should know that T, and T, (thyroxine) production are controlled by a negative feedback mechanism involving TSH (thyroid stimulating hormone) from the anterior pituitary; parathyroid hormone production is not be affected by thyroxine levels.
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B is correct. You should know that T, and T, (thyroxine) production are controlled by a negative feedback mechanism involving TSH (thyroid stimulating hormone) from the anterior pituitary; parathyroid hormone production is not be affected by thyroxine levels.
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