Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 45 - 45.2 - Concept Check - Page 1008: 4


Not necessarily.

Work Step by Step

The thyroid could be producing additional hormones because it is malfunctioning, or it could be functioning correctly but the pituitary gland is malfunctioning. In the former case, TSH levels would likely be normal, and in the latter case, they would be elevated.
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