Human Biology, 14 Edition

Published by McGraw-Hill Education
ISBN 10: 1-25924-574-8
ISBN 13: 978-1-25924-574-9

Chapter 16 - Engage - Page 357: 2

Answer

When thyroxine is secreted, a negative feed back loop operates to stop the secretion of thyroid stimulating hormone (TSH).

Work Step by Step

When blood thyroid hormone (T3 and T4) levels are low, the anterior pituitary (AP) is stimulated to secrete and release more TSH.
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