FreeMCATPrep Logo

Support us and cryptocurrency!
Try a browser that's faster, safer, ad-free, and earns you cryptocurrency for using it! W3Schools

More Than 475 Free MCAT Questions with Detailed Answers!

Click HERE for your Random Question from our MCAT Question A Day Archive

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.